Reverted unneeded changes

src/battle-scene.ts

@@ -2614,10 +2614,10 @@ export default class BattleScene extends SceneBase {
 
   addModifier(
     modifier: Modifier | null,
-    ignoreUpdate = false,
-    playSound = false,
-    virtual = false,
-    instant = false,
+    ignoreUpdate?: boolean,
+    playSound?: boolean,
+    virtual?: boolean,
+    instant?: boolean,
     cost?: number,
   ): boolean {
     // We check against modifier.type to stop a bug related to loading in a pokemon that has a form change item, which prior to some patch
@@ -2631,7 +2631,7 @@ export default class BattleScene extends SceneBase {
     this.validateAchvs(ModifierAchv, modifier);
     const modifiersToRemove: PersistentModifier[] = [];
     if (modifier instanceof PersistentModifier) {
-      if ((modifier as PersistentModifier).add(this.modifiers, virtual)) {
+      if ((modifier as PersistentModifier).add(this.modifiers, !!virtual)) {
         if (modifier instanceof PokemonFormChangeItemModifier) {
           const pokemon = this.getPokemonById(modifier.pokemonId);
           if (pokemon) {
@@ -2704,7 +2704,7 @@ export default class BattleScene extends SceneBase {
     return success;
   }
 
-  addEnemyModifier(modifier: PersistentModifier, ignoreUpdate = false, instant = false): Promise<void> {
+  addEnemyModifier(modifier: PersistentModifier, ignoreUpdate?: boolean, instant?: boolean): Promise<void> {
     return new Promise(resolve => {
       const modifiersToRemove: PersistentModifier[] = [];
       if ((modifier as PersistentModifier).add(this.enemyModifiers, false)) {
@@ -2732,128 +2732,124 @@ export default class BattleScene extends SceneBase {
    * If the recepient already has the maximum amount allowed for this item, the transfer is cancelled.
    * The quantity to transfer is automatically capped at how much the recepient can take before reaching the maximum stack size for the item.
    * A transfer that moves a quantity smaller than what is specified in the transferQuantity parameter is still considered successful.
-   * @param itemModifier - {@linkcode PokemonHeldItemModifier} to transfer (represents whole stack)
-   * @param target - Recipient {@linkcode Pokemon} recieving items
-   * @param playSound - Whether to play a sound when transferring the item
-   * @param transferQuantity - How many items of the stack to transfer. Optional, default `1`
-   * @param itemLost - Whether to treat the item's current holder as losing the item (for now, this simply enables Unburden). Default: `true`.
-   * @returns Whether the transfer was successful
+   * @param itemModifier {@linkcode PokemonHeldItemModifier} item to transfer (represents the whole stack)
+   * @param target {@linkcode Pokemon} recepient in this transfer
+   * @param playSound `true` to play a sound when transferring the item
+   * @param transferQuantity How many items of the stack to transfer. Optional, defaults to `1`
+   * @param instant ??? (Optional)
+   * @param ignoreUpdate ??? (Optional)
+   * @param itemLost If `true`, treat the item's current holder as losing the item (for now, this simply enables Unburden). Default is `true`.
+   * @returns `true` if the transfer was successful
    */
   tryTransferHeldItemModifier(
     itemModifier: PokemonHeldItemModifier,
     target: Pokemon,
     playSound: boolean,
     transferQuantity = 1,
+    instant?: boolean,
+    ignoreUpdate?: boolean,
     itemLost = true,
   ): boolean {
-    const source = itemModifier.getPokemon();
-    // Check if source even exists and error if not.
-    // Almost certainly redundant due to checking inside condition, but better log twice than not at all
-    if (isNullOrUndefined(source)) {
-      console.error(
-        `Pokemon ${target.getNameToRender()} tried to transfer %d items from nonexistent source; item: `,
-        transferQuantity,
-        itemModifier,
-      );
-      return false;
-    }
-
-    // Check for effects that might block us from stealing
+    const source = itemModifier.pokemonId ? itemModifier.getPokemon() : null;
     const cancelled = new BooleanHolder(false);
-    if (source.isPlayer() !== target.isPlayer()) {
+
+    if (source && source.isPlayer() !== target.isPlayer()) {
       applyAbAttrs(BlockItemTheftAbAttr, source, cancelled);
     }
+
     if (cancelled.value) {
       return false;
     }
 
-    // check if we have an item already and calc how much to transfer
+    const newItemModifier = itemModifier.clone() as PokemonHeldItemModifier;
+    newItemModifier.pokemonId = target.id;
     const matchingModifier = this.findModifier(
-      (m): m is PokemonHeldItemModifier =>
-        m instanceof PokemonHeldItemModifier && m.matchType(itemModifier) && m.pokemonId === target.id,
+      m => m instanceof PokemonHeldItemModifier && m.matchType(itemModifier) && m.pokemonId === target.id,
       target.isPlayer(),
-    );
+    ) as PokemonHeldItemModifier;
+
+    if (matchingModifier) {
+      const maxStackCount = matchingModifier.getMaxStackCount();
+      if (matchingModifier.stackCount >= maxStackCount) {
+        return false;
+      }
       const countTaken = Math.min(
         transferQuantity,
         itemModifier.stackCount,
-      matchingModifier?.getCountUnderMax() ?? Number.MAX_SAFE_INTEGER,
+        maxStackCount - matchingModifier.stackCount,
       );
-    if (countTaken <= 0) {
-      // Can't transfer negative items
-      return false;
-    }
-
       itemModifier.stackCount -= countTaken;
-
-    // If the old modifier is at 0 stacks, try to remove it
-    if (itemModifier.stackCount <= 0 && !this.removeModifier(itemModifier, !source.isPlayer())) {
-      return false;
-    }
-
-    // TODO: what does this do and why is it here
-    if (source.isPlayer() !== target.isPlayer()) {
-      this.updateModifiers(source.isPlayer(), false);
-    }
-
-    // Add however much we took to the recieving pokemon, creating a new modifier if the target lacked one prio
-    if (matchingModifier) {
-      matchingModifier.stackCount += countTaken;
+      newItemModifier.stackCount = matchingModifier.stackCount + countTaken;
     } else {
-      const newItemModifier = itemModifier.clone() as PokemonHeldItemModifier;
-      newItemModifier.pokemonId = target.id;
+      const countTaken = Math.min(transferQuantity, itemModifier.stackCount);
+      itemModifier.stackCount -= countTaken;
       newItemModifier.stackCount = countTaken;
-      if (target.isPlayer()) {
-        this.addModifier(newItemModifier, false, playSound);
-      } else {
-        this.addEnemyModifier(newItemModifier);
-      }
     }
 
-    if (itemLost) {
+    const removeOld = itemModifier.stackCount === 0;
+
+    if (!removeOld || !source || this.removeModifier(itemModifier, source.isEnemy())) {
+      const addModifier = () => {
+        if (!matchingModifier || this.removeModifier(matchingModifier, target.isEnemy())) {
+          if (target.isPlayer()) {
+            this.addModifier(newItemModifier, ignoreUpdate, playSound, false, instant);
+            if (source && itemLost) {
               applyPostItemLostAbAttrs(PostItemLostAbAttr, source, false);
             }
-
             return true;
           }
+          this.addEnemyModifier(newItemModifier, ignoreUpdate, instant);
+          if (source && itemLost) {
+            applyPostItemLostAbAttrs(PostItemLostAbAttr, source, false);
+          }
+          return true;
+        }
+        return false;
+      };
+      if (source && source.isPlayer() !== target.isPlayer() && !ignoreUpdate) {
+        this.updateModifiers(source.isPlayer(), instant);
+        addModifier();
+      } else {
+        addModifier();
+      }
+      return true;
+    }
+    return false;
+  }
 
   canTransferHeldItemModifier(itemModifier: PokemonHeldItemModifier, target: Pokemon, transferQuantity = 1): boolean {
-    const source = itemModifier.getPokemon();
-    if (isNullOrUndefined(source)) {
-      console.error(
-        `Pokemon ${target.getNameToRender()} tried to transfer %d items from nonexistent source; item: `,
-        transferQuantity,
-        itemModifier,
-      );
-      return false;
-    }
-
-    // If we somehow lack the item being transferred, skip
-    if (!this.hasModifier(itemModifier, !source.isPlayer())) {
-      return false;
-    }
-
-    // Check enemy theft prevention
-    // TODO: Verify whether sticky hold procs on friendly fire ally theft
-    if (source.isPlayer() !== target.isPlayer()) {
+    const mod = itemModifier.clone() as PokemonHeldItemModifier;
+    const source = mod.pokemonId ? mod.getPokemon() : null;
     const cancelled = new BooleanHolder(false);
+
+    if (source && source.isPlayer() !== target.isPlayer()) {
       applyAbAttrs(BlockItemTheftAbAttr, source, cancelled);
+    }
+
     if (cancelled.value) {
       return false;
     }
+
+    const matchingModifier = this.findModifier(
+      m => m instanceof PokemonHeldItemModifier && m.matchType(mod) && m.pokemonId === target.id,
+      target.isPlayer(),
+    ) as PokemonHeldItemModifier;
+
+    if (matchingModifier) {
+      const maxStackCount = matchingModifier.getMaxStackCount();
+      if (matchingModifier.stackCount >= maxStackCount) {
+        return false;
+      }
+      const countTaken = Math.min(transferQuantity, mod.stackCount, maxStackCount - matchingModifier.stackCount);
+      mod.stackCount -= countTaken;
+    } else {
+      const countTaken = Math.min(transferQuantity, mod.stackCount);
+      mod.stackCount -= countTaken;
     }
 
-    // Finally, ensure we can actually steal at least 1 item
-    const matchingModifier = this.findModifier(
-      (m): m is PokemonHeldItemModifier =>
-        m instanceof PokemonHeldItemModifier && m.matchType(itemModifier) && m.pokemonId === target.id,
-      target.isPlayer(),
-    );
-    const countTaken = Math.min(
-      transferQuantity,
-      itemModifier.stackCount,
-      matchingModifier?.getCountUnderMax() ?? Number.MAX_SAFE_INTEGER,
-    );
-    return countTaken > 0;
+    const removeOld = mod.stackCount === 0;
+
+    return !removeOld || !source || this.hasModifier(itemModifier, !source.isPlayer());
   }
 
   removePartyMemberModifiers(partyMemberIndex: number): Promise<void> {
@@ -2971,10 +2967,8 @@ export default class BattleScene extends SceneBase {
     [this.modifierBar, this.enemyModifierBar].map(m => m.setVisible(visible));
   }
 
-  /**
-   * @param instant - Whether to instantly update any changes to party members' HP bars; default `false`
-   */
-  updateModifiers(player = true, instant = false): void {
+  // TODO: Document this
+  updateModifiers(player = true, instant?: boolean): void {
     const modifiers = player ? this.modifiers : (this.enemyModifiers as PersistentModifier[]);
     for (let m = 0; m < modifiers.length; m++) {
       const modifier = modifiers[m];
@@ -2991,7 +2985,6 @@ export default class BattleScene extends SceneBase {
       }
     }
 
-    // Why do we silently delete missing modifiers?
     const modifiersClone = modifiers.slice(0);
     for (const modifier of modifiersClone) {
       if (!modifier.getStackCount()) {
@@ -3006,13 +2999,7 @@ export default class BattleScene extends SceneBase {
     }
   }
 
-  /**
-   * Update one or more Pokemon's info containers after having recieved modifiers.
-   * @param party - An array of {@linkcode Pokemon} to update info.
-   * @param instant - Whether to instantly update any changes to the party's HP bars; default `false`
-   * @returns A Promise that resolves once all the info containers have been updated.
-   */
-  updatePartyForModifiers(party: Pokemon[], instant = false): Promise<void> {
+  updatePartyForModifiers(party: Pokemon[], instant?: boolean): Promise<void> {
     return new Promise(resolve => {
       Promise.allSettled(
         party.map(p => {
@@ -3023,32 +3010,23 @@ export default class BattleScene extends SceneBase {
     });
   }
 
-  /**
-   * Check whether a given {@linkcode PersistentModifier} exists on a given side of the field.
-   * @param modifier - The {@linkcode PersistentModifier} to check the existence of.
-   * @param enemy - Whether to check the enemy (`true`) or player (`false`) party. Default is `false`.
-   * @returns Whether the specified modifier exists on the given side of the field.
-   * @remarks This also compares `pokemonId`s to confirm a match (and therefore owners).
-   */
   hasModifier(modifier: PersistentModifier, enemy = false): boolean {
-    return (!enemy ? this.modifiers : this.enemyModifiers).includes(modifier);
+    const modifiers = !enemy ? this.modifiers : this.enemyModifiers;
+    return modifiers.indexOf(modifier) > -1;
   }
 
   /**
-   * Remove a currently owned item. If the item is stacked, the entire item stack
+   * Removes a currently owned item. If the item is stacked, the entire item stack
    * gets removed. This function does NOT apply in-battle effects, such as Unburden.
    * If in-battle effects are needed, use {@linkcode Pokemon.loseHeldItem} instead.
-   * @param modifier - The item to be removed.
-   * @param enemy - Whether to remove from the enemy (`true`) or player (`false`) party; default `false`.
-   * @returns Whether the item exists and was successfully removed
+   * @param modifier The item to be removed.
+   * @param enemy `true` to remove an item owned by the enemy rather than the player; default `false`.
+   * @returns `true` if the item exists and was successfully removed, `false` otherwise
    */
   removeModifier(modifier: PersistentModifier, enemy = false): boolean {
     const modifiers = !enemy ? this.modifiers : this.enemyModifiers;
     const modifierIndex = modifiers.indexOf(modifier);
-    if (modifierIndex === -1) {
-      return false;
-    }
-
+    if (modifierIndex > -1) {
       modifiers.splice(modifierIndex, 1);
       if (modifier instanceof PokemonFormChangeItemModifier) {
         const pokemon = this.getPokemonById(modifier.pokemonId);
@@ -3059,35 +3037,17 @@ export default class BattleScene extends SceneBase {
       return true;
     }
 
-  /**
-   * Get all modifiers of all {@linkcode Pokemon} in the given party,
-   * optionally filtering based on `modifierType` if provided.
-   * @param player Whether to search the player (`true`) or enemy (`false`) party; Defaults to `true`
-   * @returns An array containing all {@linkcode PersistentModifier}s on the given side of the field.
-   * @overload
-   */
-  getModifiers(player?: boolean): PersistentModifier[];
-
-  /**
-   * Get all modifiers of all {@linkcode Pokemon} in the given party,
-   * optionally filtering based on `modifierType` if provided.
-   * @param modifierType The type of modifier to check against; must extend {@linkcode PersistentModifier}.
-   * If omitted, will return all {@linkcode PersistentModifier}s regardless of type.
-   * @param player Whether to search the player (`true`) or enemy (`false`) party; Defaults to `true`
-   * @returns An array containing all modifiers matching `modifierType` on the given side of the field.
-   * @overload
-   */
-  getModifiers<T extends PersistentModifier>(modifierType: Constructor<T>, player?: boolean): T[];
-
-  // NOTE: Boolean typing on 1st parameter needed to satisfy "bool only" overload
-  getModifiers<T extends PersistentModifier>(modifierType?: Constructor<T> | boolean, player?: boolean) {
-    const usePlayer: boolean = player ?? (typeof modifierType !== "boolean" || modifierType); // non-bool in 1st position = true by default
-    const mods = usePlayer ? this.modifiers : this.enemyModifiers;
-
-    if (typeof modifierType === "undefined" || typeof modifierType === "boolean") {
-      return mods;
+    return false;
   }
-    return mods.filter((m): m is T => m instanceof modifierType);
+
+  /**
+   * Get all of the modifiers that match `modifierType`
+   * @param modifierType The type of modifier to apply; must extend {@linkcode PersistentModifier}
+   * @param player Whether to search the player (`true`) or the enemy (`false`); Defaults to `true`
+   * @returns the list of all modifiers that matched `modifierType`.
+   */
+  getModifiers<T extends PersistentModifier>(modifierType: Constructor<T>, player = true): T[] {
+    return (player ? this.modifiers : this.enemyModifiers).filter((m): m is T => m instanceof modifierType);
   }
 
   /**

src/battle.ts

@@ -176,12 +176,18 @@ export default class Battle {
   }
 
   addPostBattleLoot(enemyPokemon: EnemyPokemon): void {
-    // Push used instead of concat to avoid extra allocation
     this.postBattleLoot.push(
-      ...(globalScene.findModifiers(
+      ...globalScene
+        .findModifiers(
           m => m instanceof PokemonHeldItemModifier && m.pokemonId === enemyPokemon.id && m.isTransferable,
           false,
-      ) as PokemonHeldItemModifier[]),
+        )
+        .map(i => {
+          const ret = i as PokemonHeldItemModifier;
+          //@ts-ignore - this is awful to fix/change
+          ret.pokemonId = null;
+          return ret;
+        }),
     );
   }
 

src/data/abilities/ability.ts

@@ -2539,17 +2539,11 @@ export class AllyStatMultiplierAbAttr extends AbAttr {
  * @extends AbAttr
  */
 export class ExecutedMoveAbAttr extends AbAttr {
-  canApplyExecutedMove(
-    _pokemon: Pokemon,
-    _simulated: boolean,
-  ): boolean {
+  canApplyExecutedMove(_pokemon: Pokemon, _simulated: boolean): boolean {
     return true;
   }
 
-  applyExecutedMove(
-    _pokemon: Pokemon,
-    _simulated: boolean,
-  ): void {}
+  applyExecutedMove(_pokemon: Pokemon, _simulated: boolean): void {}
 }
 
 /**
@@ -2557,7 +2551,7 @@ export class ExecutedMoveAbAttr extends AbAttr {
  * @extends ExecutedMoveAbAttr
  */
 export class GorillaTacticsAbAttr extends ExecutedMoveAbAttr {
-  constructor(showAbility: boolean = false) {
+  constructor(showAbility = false) {
     super(showAbility);
   }
 
@@ -2574,7 +2568,7 @@ export class GorillaTacticsAbAttr extends ExecutedMoveAbAttr {
 
 export class PostAttackStealHeldItemAbAttr extends PostAttackAbAttr {
   private stealCondition: PokemonAttackCondition | null;
-  private stolenItem: PokemonHeldItemModifier;
+  private stolenItem?: PokemonHeldItemModifier;
 
   constructor(stealCondition?: PokemonAttackCondition) {
     super();
@@ -2591,35 +2585,38 @@ export class PostAttackStealHeldItemAbAttr extends PostAttackAbAttr {
     hitResult: HitResult,
     args: any[],
   ): boolean {
-    // Check which items to steal
-    const heldItems = this.getTargetHeldItems(defender).filter((i) => i.isTransferable);
     if (
-      !super.canApplyPostAttack(pokemon, passive, simulated, defender, move, hitResult, args) ||
-      heldItems.length === 0 || // no items to steal
-      hitResult >= HitResult.NO_EFFECT || // move was ineffective/protected against
-      (this.stealCondition && !this.stealCondition(pokemon, defender, move)) // no condition = pass
+      super.canApplyPostAttack(pokemon, passive, simulated, defender, move, hitResult, args) &&
+      !simulated &&
+      hitResult < HitResult.NO_EFFECT &&
+      (!this.stealCondition || this.stealCondition(pokemon, defender, move))
     ) {
-      return false;
-    }
-
-    // pick random item and check if we can steal it
+      const heldItems = this.getTargetHeldItems(defender).filter(i => i.isTransferable);
+      if (heldItems.length) {
+        // Ensure that the stolen item in testing is the same as when the effect is applied
         this.stolenItem = heldItems[pokemon.randBattleSeedInt(heldItems.length)];
-    return globalScene.canTransferHeldItemModifier(this.stolenItem, pokemon)
+        if (globalScene.canTransferHeldItemModifier(this.stolenItem, pokemon)) {
+          return true;
+        }
+      }
+    }
+    this.stolenItem = undefined;
+    return false;
   }
 
   override applyPostAttack(
     pokemon: Pokemon,
     _passive: boolean,
-    simulated: boolean,
+    _simulated: boolean,
     defender: Pokemon,
     _move: Move,
     _hitResult: HitResult,
     _args: any[],
   ): void {
-    if (simulated) {
-      return;
+    const heldItems = this.getTargetHeldItems(defender).filter(i => i.isTransferable);
+    if (!this.stolenItem) {
+      this.stolenItem = heldItems[pokemon.randBattleSeedInt(heldItems.length)];
     }
-
     if (globalScene.tryTransferHeldItemModifier(this.stolenItem, pokemon, false)) {
       globalScene.phaseManager.queueMessage(
         i18next.t("abilityTriggers:postAttackStealHeldItem", {
@@ -2629,6 +2626,7 @@ export class PostAttackStealHeldItemAbAttr extends PostAttackAbAttr {
         }),
       );
     }
+    this.stolenItem = undefined;
   }
 
   getTargetHeldItems(target: Pokemon): PokemonHeldItemModifier[] {
@@ -6217,45 +6215,36 @@ export class PostBattleAbAttr extends AbAttr {
 }
 
 export class PostBattleLootAbAttr extends PostBattleAbAttr {
-  /** The index of the random item to steal. */
-  private randItemIndex = 0;
+  private randItem?: PokemonHeldItemModifier;
+
+  override canApplyPostBattle(pokemon: Pokemon, _passive: boolean, simulated: boolean, args: any[]): boolean {
+    const postBattleLoot = globalScene.currentBattle.postBattleLoot;
+    if (!simulated && postBattleLoot.length && args[0]) {
+      this.randItem = randSeedItem(postBattleLoot);
+      return globalScene.canTransferHeldItemModifier(this.randItem, pokemon, 1);
+    }
+    return false;
+  }
 
   /**
    * @param _args - `[0]`: boolean for if the battle ended in a victory
    */
-  override canApplyPostBattle(pokemon: Pokemon, _passive: boolean, simulated: boolean, args: [boolean]): boolean {
+  override applyPostBattle(pokemon: Pokemon, _passive: boolean, _simulated: boolean, _args: any[]): void {
     const postBattleLoot = globalScene.currentBattle.postBattleLoot;
-    const wasVictory = args[0];
-    if (simulated || postBattleLoot.length === 0 || !wasVictory) {
-      return false;
+    if (!this.randItem) {
+      this.randItem = randSeedItem(postBattleLoot);
     }
 
-    // Pick a random item and check if we are capped.
-    this.randItemIndex = randSeedInt(postBattleLoot.length);
-    const item = postBattleLoot[this.randItemIndex]
-
-    // We can't use `canTransferItemModifier` as that assumes the Pokemon in question already exists (which it does not)
-    const existingItem = globalScene.findModifier(
-      (m): m is PokemonHeldItemModifier =>
-        m instanceof PokemonHeldItemModifier && m.matchType(item) && m.pokemonId === pokemon.id,
-      pokemon.isPlayer(),
-    ) as PokemonHeldItemModifier | undefined;
-
-    return (existingItem?.getCountUnderMax() ?? Number.MAX_SAFE_INTEGER) > 1
-  }
-
-  /**
-   * Attempt to give the previously selected random item to the ability holder at battle end.
-   */
-  override applyPostBattle(pokemon: Pokemon): void {
-    const postBattleLoot = globalScene.currentBattle.postBattleLoot;
-    const item = postBattleLoot[this.randItemIndex]
-    item.pokemonId = pokemon.id;
-
-    if (globalScene.addModifier(item, false, true)) {
-      postBattleLoot.splice(this.randItemIndex, 1);
-      globalScene.phaseManager.queueMessage(i18next.t("abilityTriggers:postBattleLoot", { pokemonNameWithAffix: getPokemonNameWithAffix(pokemon), itemName: item.type.name }));
+    if (globalScene.tryTransferHeldItemModifier(this.randItem, pokemon, true, 1, true, undefined, false)) {
+      postBattleLoot.splice(postBattleLoot.indexOf(this.randItem), 1);
+      globalScene.phaseManager.queueMessage(
+        i18next.t("abilityTriggers:postBattleLoot", {
+          pokemonNameWithAffix: getPokemonNameWithAffix(pokemon),
+          itemName: this.randItem.type.name,
+        }),
+      );
     }
+    this.randItem = undefined;
   }
 }
 
@@ -7790,7 +7779,7 @@ export function applyPreAttackAbAttrs(
 export function applyExecutedMoveAbAttrs(
   attrType: Constructor<ExecutedMoveAbAttr>,
   pokemon: Pokemon,
-  simulated: boolean = false,
+  simulated = false,
   ...args: any[]
 ): void {
   applyAbAttrsInternal<ExecutedMoveAbAttr>(
@@ -8401,8 +8390,7 @@ export function initAbilities() {
     new Ability(AbilityId.STICKY_HOLD, 3)
       .attr(BlockItemTheftAbAttr)
       .bypassFaint()
-      .ignorable()
-      .edgeCase(), // may or may not proc incorrectly on user's allies
+      .ignorable(),
     new Ability(AbilityId.SHED_SKIN, 3)
       .conditionalAttr(_pokemon => !randSeedInt(3), PostTurnResetStatusAbAttr),
     new Ability(AbilityId.GUTS, 3)

src/field/pokemon.ts

@@ -5131,13 +5131,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       }
     });
 
-    globalScene.phaseManager.queueMessage(
-      i18next.t("battleInfo:newKey2", {
-        // arguments for the locale key go here;
-        pokemonNameWithAffix: getPokemonNameWithAffix(this),
-      }),
-    );
-
     for (let f = 0; f < 2; f++) {
       const variantColors = variantColorCache[!f ? spriteKey : backSpriteKey];
       const variantColorSet = new Map<number, number[]>();
@@ -6006,8 +5999,9 @@ export class PlayerPokemon extends Pokemon {
       true,
     ) as PokemonHeldItemModifier[];
     for (const modifier of fusedPartyMemberHeldModifiers) {
-      globalScene.tryTransferHeldItemModifier(modifier, this, false, modifier.getStackCount(), false);
+      globalScene.tryTransferHeldItemModifier(modifier, this, false, modifier.getStackCount(), true, true, false);
     }
+    globalScene.updateModifiers(true, true);
     globalScene.removePartyMemberModifiers(fusedPartyMemberIndex);
     globalScene.getPlayerParty().splice(fusedPartyMemberIndex, 1)[0];
     const newPartyMemberIndex = globalScene.getPlayerParty().indexOf(this);

src/phases/switch-summon-phase.ts

@@ -159,7 +159,15 @@ export class SwitchSummonPhase extends SummonPhase {
         ) as SwitchEffectTransferModifier;
 
         if (batonPassModifier) {
-          globalScene.tryTransferHeldItemModifier(batonPassModifier, switchedInPokemon, false, 1, false);
+          globalScene.tryTransferHeldItemModifier(
+            batonPassModifier,
+            switchedInPokemon,
+            false,
+            undefined,
+            undefined,
+            undefined,
+            false,
+          );
         }
       }
     }

src/ui/battle-info/battle-info.ts

@@ -538,14 +538,9 @@ export default abstract class BattleInfo extends Phaser.GameObjects.Container {
     this.updateHpFrame();
   }
 
-  /**
-   * Update a Pokemon's HP bar.
-   * @param pokemon - The {@linkcode Pokemon} to whom the HP bar belongs.
-   * @param resolve - A promise to which the HP bar will be chained unto.
-   * @param instant - Whether to instantly update the pokemon's HP bar; default `false`
-   */
-  protected updatePokemonHp(pokemon: Pokemon, resolve: (r: void | PromiseLike<void>) => void, instant = false): void {
-    let duration = instant ? 0 : Phaser.Math.Clamp(Math.abs(this.lastHp - pokemon.hp) * 5, 250, 5000);
+  /** Update the pokemonHp bar */
+  protected updatePokemonHp(pokemon: Pokemon, resolve: (r: void | PromiseLike<void>) => void, instant?: boolean): void {
+    let duration = !instant ? Phaser.Math.Clamp(Math.abs(this.lastHp - pokemon.hp) * 5, 250, 5000) : 0;
     const speed = globalScene.hpBarSpeed;
     if (speed) {
       duration = speed >= 3 ? 0 : duration / Math.pow(2, speed);
@@ -568,13 +563,7 @@ export default abstract class BattleInfo extends Phaser.GameObjects.Container {
 
   //#endregion
 
-  /**
-   * Update a Pokemon's battle info, HP bar and other effects.
-   * @param pokemon - The {@linkcode} Pokemon to whom this BattleInfo belongs.
-   * @param instant - Whether to instantly update any changes to this Pokemon's HP bar; default `false`
-   * @returns A Promise that resolves once the Pokemon's info has been successfully updated.
-   */
-  async updateInfo(pokemon: Pokemon, instant = false): Promise<void> {
+  async updateInfo(pokemon: Pokemon, instant?: boolean): Promise<void> {
     let resolve: (r: void | PromiseLike<void>) => void = () => {};
     const promise = new Promise<void>(r => (resolve = r));
     if (!globalScene) {