squash

src/data/ability.ts

@@ -3343,6 +3343,7 @@ export class PostWeatherLapseDamageAbAttr extends PostWeatherLapseAbAttr {
       const abilityName = (!passive ? pokemon.getAbility() : pokemon.getPassiveAbility()).name;
       scene.queueMessage(i18next.t("abilityTriggers:postWeatherLapseDamage", { pokemonNameWithAffix: getPokemonNameWithAffix(pokemon), abilityName }));
       pokemon.damageAndUpdate(Utils.toDmgValue(pokemon.getMaxHp() / (16 / this.damageFactor)), HitResult.OTHER);
+      pokemon.turnData.lastDmgSrc = WeatherType.HARSH_SUN;
     }
 
     return true;

src/data/move.ts

@@ -1352,6 +1352,7 @@ export class RecoilAttr extends MoveEffectAttr {
     user.damageAndUpdate(recoilDamage, HitResult.OTHER, false, true, true);
     user.scene.queueMessage(i18next.t("moveTriggers:hitWithRecoil", { pokemonName: getPokemonNameWithAffix(user) }));
     user.turnData.damageTaken += recoilDamage;
+    user.turnData.lastDmgSrc = user.id;
 
     return true;
   }

src/field/pokemon.ts

@@ -2796,6 +2796,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           this.battleData.hitCount++;
           const attackResult = { move: move.id, result: result as DamageResult, damage: damage, critical: isCritical, sourceId: source.id, sourceBattlerIndex: source.getBattlerIndex() };
           this.turnData.attacksReceived.unshift(attackResult);
+          this.turnData.lastDmgSrc = source;
           if (source.isPlayer() && !this.isPlayer()) {
             this.scene.applyModifiers(DamageMoneyRewardModifier, true, source, new Utils.NumberHolder(damage));
           }
@@ -5125,6 +5126,7 @@ export class PokemonTurnData {
   public statStagesDecreased: boolean = false;
   public moveEffectiveness: TypeDamageMultiplier | null = null;
   public combiningPledge?: Moves;
+  public lastDmgSrc: Pokemon | WeatherType | StatusEffect;
 }
 
 export enum AiType {

src/phases/faint-phase.ts

@@ -96,8 +96,9 @@ export class FaintPhase extends PokemonPhase {
     const alivePlayField = this.scene.getField(true);
     alivePlayField.forEach(p => applyPostKnockOutAbAttrs(PostKnockOutAbAttr, p, pokemon));
     if (pokemon.turnData?.attacksReceived?.length) {
-      const defeatSource = this.scene.getPokemonById(pokemon.turnData.attacksReceived[0].sourceId);
-      if (defeatSource?.isOnField()) {
+      const defeatSource = pokemon.turnData.lastDmgSrc;
+
+      if (defeatSource instanceof Pokemon && defeatSource?.isOnField()) {
         applyPostVictoryAbAttrs(PostVictoryAbAttr, defeatSource);
         const pvmove = allMoves[pokemon.turnData.attacksReceived[0].move];
         const pvattrs = pvmove.getAttrs(PostVictoryStatStageChangeAttr);

src/phases/post-turn-status-effect-phase.ts

@@ -28,13 +28,16 @@ export class PostTurnStatusEffectPhase extends PokemonPhase {
         switch (pokemon.status.effect) {
           case StatusEffect.POISON:
             damage.value = Math.max(pokemon.getMaxHp() >> 3, 1);
+            pokemon.turnData.lastDmgSrc = StatusEffect.POISON;
             break;
           case StatusEffect.TOXIC:
             damage.value = Math.max(Math.floor((pokemon.getMaxHp() / 16) * pokemon.status.toxicTurnCount), 1);
+            pokemon.turnData.lastDmgSrc = StatusEffect.TOXIC;
             break;
           case StatusEffect.BURN:
             damage.value = Math.max(pokemon.getMaxHp() >> 4, 1);
             applyAbAttrs(ReduceBurnDamageAbAttr, pokemon, null, false, damage);
+            pokemon.turnData.lastDmgSrc = StatusEffect.BURN;
             break;
         }
         if (damage.value) {

src/phases/weather-effect-phase.ts

@@ -54,6 +54,9 @@ export class WeatherEffectPhase extends CommonAnimPhase {
           const immune = !pokemon || !!pokemon.getTypes(true, true).filter(t => this.weather?.isTypeDamageImmune(t)).length;
           if (!immune) {
             inflictDamage(pokemon);
+            if (this.weather?.weatherType) {
+              pokemon.turnData.lastDmgSrc = this.weather.weatherType;
+            }
           }
         });
       }

src/test/moves/fell_stinger.test.ts

@@ -0,0 +1,121 @@
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import GameManager from "../utils/gameManager";
+import { Species } from "#enums/species";
+import { Abilities } from "#enums/abilities";
+import { Moves } from "#enums/moves";
+import { Stat } from "#enums/stat";
+import { StatusEffect } from "#app/enums/status-effect";
+import { WeatherType } from "#app/enums/weather-type";
+
+
+describe("Moves - Fell Stinger", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+
+    game.override.battleType("single")
+      .moveset([ Moves.FELL_STINGER ])
+      .startingLevel(50);
+
+    game.override.enemyAbility(Abilities.STURDY)
+      .enemySpecies(Species.HYPNO)
+      .enemyLevel(5)
+      .enemyHeldItems([]);
+
+    game.override.weather(WeatherType.NONE);
+  });
+
+  it("should not grant stat boost when opponent gets KO'd by recoil", async () => {
+    game.override.enemyMoveset([ Moves.DOUBLE_EDGE ]);
+    await game.classicMode.startBattle([ Species.LEAVANNY ]);
+
+    const leadPokemon = game.scene.getPlayerPokemon()!;
+    game.move.select(Moves.FELL_STINGER);
+
+    await game.phaseInterceptor.to("VictoryPhase");
+
+    expect(leadPokemon.getStatStage(Stat.ATK) === 0); // Attack stage should still be at 0
+  });
+
+  it("should not grant stat boost when enemy is KO'd by status effect", async () => {
+    game.override
+      .enemyMoveset(Moves.SPLASH)
+      .enemyStatusEffect(StatusEffect.BURN);
+    await game.classicMode.startBattle([ Species.LEAVANNY ]);
+
+    const leadPokemon = game.scene.getPlayerPokemon()!;
+    game.move.select(Moves.FELL_STINGER);
+
+    await game.phaseInterceptor.to("VictoryPhase");
+
+    expect(leadPokemon.getStatStage(Stat.ATK) === 0); // Attack stage should still be at 0
+  });
+
+  it("should not grant stat boost when enemy is KO'd by damaging weather", async () => {
+    game.override.weather(WeatherType.HAIL);
+    await game.classicMode.startBattle([ Species.LEAVANNY ]);
+
+    const leadPokemon = game.scene.getPlayerPokemon()!;
+
+    game.move.select(Moves.FELL_STINGER);
+
+    await game.phaseInterceptor.to("VictoryPhase");
+
+    expect(leadPokemon.getStatStage(Stat.ATK) === 0); // Attack stage should still be at 0
+  });
+
+  it("should not grant stat boost when enemy is KO'd by Dry Skin + Harsh Sunlight", async () => {
+    game.override
+      .enemyPassiveAbility(Abilities.STURDY)
+      .enemyAbility(Abilities.DRY_SKIN)
+      .weather(WeatherType.HARSH_SUN);
+    await game.challengeMode.startBattle([ Species.LEAVANNY ]);
+
+    const leadPokemon = game.scene.getPlayerPokemon()!;
+
+    game.move.select(Moves.FELL_STINGER);
+
+    await game.phaseInterceptor.to("VictoryPhase");
+
+    expect(leadPokemon.getStatStage(Stat.ATK) === 0); // Attack stage should still be at 0
+  });
+
+  it("should not grant stat boost if enemy is saved by Reviver Seed", async () => {
+    game.override
+      .enemyAbility(Abilities.KLUTZ)
+      .enemyHeldItems([{ name: "REVIVER_SEED" }]);
+
+    await game.classicMode.startBattle([ Species.LEAVANNY ]);
+
+    const leadPokemon = game.scene.getPlayerPokemon()!;
+    game.move.select(Moves.FELL_STINGER);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expect(leadPokemon.getStatStage(Stat.ATK) === 0); // Attack stage should still be at 0
+  });
+
+  it("should grant stat boost when enemy dies directly to hit", async () => {
+    game.override.enemyAbility(Abilities.KLUTZ);
+    await game.challengeMode.startBattle([ Species.LEAVANNY ]);
+
+    const leadPokemon = game.scene.getPlayerPokemon()!;
+    game.move.select(Moves.FELL_STINGER);
+
+    await game.phaseInterceptor.to("VictoryPhase");
+
+    expect(leadPokemon.getStatStage(Stat.ATK) === 3); // Attack stage should have risen to 3
+  });
+});