fully implement gorilla tactics

src/data/ability.ts

@@ -1624,6 +1624,40 @@ export class PostAttackAbAttr extends AbAttr {
   }
 }
 
+/**
+ * Ability attribute for Gorilla Tactics
+ * @extends PostAttackAbAttr
+ */
+export class GorillaTacticsAbAttr extends PostAttackAbAttr {
+  constructor() {
+    super((user, target, move) => true);
+  }
+
+  /**
+   *
+   * @param {Pokemon} pokemon the {@linkcode Pokemon} with this ability
+   * @param passive n/a
+   * @param simulated whether the ability is being simulated
+   * @param defender n/a
+   * @param move n/a
+   * @param hitResult n/a
+   * @param args n/a
+   * @returns `true` if the ability is applied
+   */
+  applyPostAttackAfterMoveTypeCheck(pokemon: Pokemon, passive: boolean, simulated: boolean, defender: Pokemon, move: Move, hitResult: HitResult | null, args: any[]): boolean | Promise<boolean> {
+    if (simulated) {
+      return simulated;
+    }
+
+    if (pokemon.getTag(BattlerTagType.GORILLA_TACTICS)) {
+      return false;
+    }
+
+    pokemon.addTag(BattlerTagType.GORILLA_TACTICS);
+    return true;
+  }
+}
+
 export class PostAttackStealHeldItemAbAttr extends PostAttackAbAttr {
   private stealCondition: PokemonAttackCondition | null;
 
@@ -5595,7 +5629,7 @@ export function initAbilities() {
       .bypassFaint()
       .partial(),
     new Ability(Abilities.GORILLA_TACTICS, 8)
-      .unimplemented(),
+      .attr(GorillaTacticsAbAttr),
     new Ability(Abilities.NEUTRALIZING_GAS, 8)
       .attr(SuppressFieldAbilitiesAbAttr)
       .attr(UncopiableAbilityAbAttr)

src/data/battler-tags.ts

@@ -107,8 +107,8 @@ export interface TerrainBattlerTag {
  * to select restricted moves.
  */
 export abstract class MoveRestrictionBattlerTag extends BattlerTag {
-  constructor(tagType: BattlerTagType, turnCount: integer, sourceMove?: Moves, sourceId?: integer) {
-    super(tagType, [ BattlerTagLapseType.PRE_MOVE, BattlerTagLapseType.TURN_END ], turnCount, sourceMove, sourceId);
+  constructor(tagType: BattlerTagType, lapseType: BattlerTagLapseType | BattlerTagLapseType[], turnCount: integer, sourceMove?: Moves, sourceId?: integer) {
+    super(tagType, lapseType, turnCount, sourceMove, sourceId);
   }
 
   /** @override */
@@ -119,7 +119,9 @@ export abstract class MoveRestrictionBattlerTag extends BattlerTag {
       const move = phase.move;
 
       if (this.isMoveRestricted(move.moveId)) {
-        pokemon.scene.queueMessage(this.interruptedText(pokemon, move.moveId));
+        if (this.interruptedText(pokemon, move.moveId)) {
+          pokemon.scene.queueMessage(this.interruptedText(pokemon, move.moveId));
+        }
         phase.cancel();
       }
 
@@ -155,7 +157,9 @@ export abstract class MoveRestrictionBattlerTag extends BattlerTag {
    * @param {Moves} move {@linkcode Moves} ID of the move being interrupted
    * @returns {string} text to display when the move is interrupted
    */
-  abstract interruptedText(pokemon: Pokemon, move: Moves): string;
+  interruptedText(pokemon: Pokemon, move: Moves): string {
+    return "";
+  }
 }
 
 /**
@@ -167,7 +171,7 @@ export class DisabledTag extends MoveRestrictionBattlerTag {
   private moveId: Moves = Moves.NONE;
 
   constructor(sourceId: number) {
-    super(BattlerTagType.DISABLED, 4, Moves.DISABLE, sourceId);
+    super(BattlerTagType.DISABLED, [ BattlerTagLapseType.PRE_MOVE, BattlerTagLapseType.TURN_END ], 4, Moves.DISABLE, sourceId);
   }
 
   /** @override */
@@ -178,7 +182,7 @@ export class DisabledTag extends MoveRestrictionBattlerTag {
   /**
    * @override
    *
-   * Ensures that move history exists on `pokemon` and has a valid move. If so, sets the {@link moveId} and shows a message.
+   * Ensures that move history exists on `pokemon` and has a valid move. If so, sets the {@linkcode moveId} and shows a message.
    * Otherwise the move ID will not get assigned and this tag will get removed next turn.
    */
   override onAdd(pokemon: Pokemon): void {
@@ -207,8 +211,12 @@ export class DisabledTag extends MoveRestrictionBattlerTag {
     return i18next.t("battle:moveDisabled", { moveName: allMoves[move].name });
   }
 
-  /** @override */
-  override interruptedText(pokemon: Pokemon, move: Moves): string {
+  /**
+   * @param {Pokemon} pokemon {@linkcode Pokemon} attempting to use the restricted move
+   * @param {Moves} move {@linkcode Moves} ID of the move being interrupted
+   * @returns {string} text to display when the move is interrupted
+   */
+  interruptedText(pokemon: Pokemon, move: Moves): string {
     return i18next.t("battle:disableInterruptedMove", { pokemonNameWithAffix: getPokemonNameWithAffix(pokemon), moveName: allMoves[move].name });
   }
 
@@ -219,6 +227,73 @@ export class DisabledTag extends MoveRestrictionBattlerTag {
   }
 }
 
+/**
+ * Tag used by Gorilla Tactics to restrict the user to using only one move.
+ * @extends MoveRestrictionBattlerTag
+ */
+export class GorillaTacticsTag extends MoveRestrictionBattlerTag {
+  private moveId = Moves.NONE;
+
+  constructor() {
+    super(BattlerTagType.GORILLA_TACTICS, BattlerTagLapseType.CUSTOM, 0);
+  }
+
+  /** @override */
+  override isMoveRestricted(move: Moves): boolean {
+    return move !== this.moveId;
+  }
+
+  /**
+   * @override
+   * @param {Pokemon} pokemon the {@linkcode Pokemon} to check if the tag can be added
+   * @returns `true` if the pokemon has a valid move and no existing {@linkcode GorillaTacticsTag}; `false` otherwise
+   */
+  override canAdd(pokemon: Pokemon): boolean {
+    return (this.getLastValidMove(pokemon) !== undefined) && !pokemon.getTag(GorillaTacticsTag);
+  }
+
+  /**
+   * Ensures that move history exists on {@linkcode Pokemon} and has a valid move.
+   * If so, sets the {@linkcode moveId} and increases the user's Attack by one stage.
+   * @override
+   * @param {Pokemon} pokemon the {@linkcode Pokemon} to add the tag to
+   */
+  override onAdd(pokemon: Pokemon): void {
+    const lastValidMove = this.getLastValidMove(pokemon);
+
+    if (!lastValidMove) {
+      return;
+    }
+
+    this.moveId = lastValidMove;
+    pokemon.setStatStage(Stat.ATK, 1);
+    pokemon.updateInfo();
+  }
+
+  /**
+   *
+   * @override
+   * @param {Pokemon} pokemon n/a
+   * @param {Moves} move {@linkcode Moves} ID of the move being denied
+   * @returns {string} text to display when the move is denied
+  */
+  override selectionDeniedText(pokemon: Pokemon, move: Moves): string {
+    return i18next.t("battle:canOnlyUseMove", { moveName: allMoves[this.moveId].name, pokemonName: getPokemonNameWithAffix(pokemon) });
+  }
+
+  /**
+   * Gets the last valid move from the pokemon's move history.
+   * @param {Pokemon} pokemon {@linkcode Pokemon} to get the last valid move from
+   * @returns {Moves | undefined} the last valid move from the pokemon's move history
+   */
+  getLastValidMove(pokemon: Pokemon): Moves | undefined {
+    const move = pokemon.getLastXMoves()
+      .find(m => m.move !== Moves.NONE && m.move !== Moves.STRUGGLE && !m.virtual);
+
+    return move?.move;
+  }
+}
+
 /**
  * BattlerTag that represents the "recharge" effects of moves like Hyper Beam.
  */
@@ -2125,6 +2200,8 @@ export function getBattlerTag(tagType: BattlerTagType, turnCount: number, source
   case BattlerTagType.GULP_MISSILE_ARROKUDA:
   case BattlerTagType.GULP_MISSILE_PIKACHU:
     return new GulpMissileTag(tagType, sourceMove);
+  case BattlerTagType.GORILLA_TACTICS:
+    return new GorillaTacticsTag();
   case BattlerTagType.NONE:
   default:
     return new BattlerTag(tagType, BattlerTagLapseType.CUSTOM, turnCount, sourceMove, sourceId);

src/enums/battler-tag-type.ts

@@ -73,4 +73,5 @@ export enum BattlerTagType {
   SHELL_TRAP = "SHELL_TRAP",
   DRAGON_CHEER = "DRAGON_CHEER",
   NO_RETREAT = "NO_RETREAT",
+  GORILLA_TACTICS = "GORILLA_TACTICS",
 }

src/locales/en/battle.json

@@ -44,6 +44,7 @@
   "moveNotImplemented": "{{moveName}} is not yet implemented and cannot be selected.",
   "moveNoPP": "There's no PP left for\nthis move!",
   "moveDisabled": "{{moveName}} is disabled!",
+  "canOnlyUseMove": "{{pokemonName}} can only use {{moveName}}!",
   "disableInterruptedMove": "{{pokemonNameWithAffix}}'s {{moveName}}\nis disabled!",
   "noPokeballForce": "An unseen force\nprevents using Poké Balls.",
   "noPokeballTrainer": "You can't catch\nanother trainer's Pokémon!",

src/test/abilities/gorilla_tactics.test.ts

@@ -0,0 +1,87 @@
+import { BattlerIndex } from "#app/battle";
+import { Moves } from "#app/enums/moves";
+import { Species } from "#app/enums/species";
+import { Stat } from "#app/enums/stat";
+import { Abilities } from "#enums/abilities";
+import GameManager from "#test/utils/gameManager";
+import { SPLASH_ONLY } from "#test/utils/testUtils";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+describe("Abilities - Gorilla Tactics", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+  const TIMEOUT = 20 * 1000;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .battleType("single")
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(SPLASH_ONLY)
+      .enemySpecies(Species.MAGIKARP)
+      .enemyLevel(30)
+      .moveset([Moves.SPLASH, Moves.TACKLE])
+      .ability(Abilities.GORILLA_TACTICS);
+  });
+
+  it("boosts the Pokémon's Attack by 50%, but limits the Pokémon to using only one move", async () => {
+    await game.classicMode.startBattle([Species.GALAR_DARMANITAN]);
+
+    const darmanitan = game.scene.getPlayerPokemon()!;
+
+    game.move.select(Moves.SPLASH);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(darmanitan.getStatStage(Stat.ATK)).toBe(1);
+    // Other moves should be restricted
+    expect(darmanitan.isMoveRestricted(Moves.TACKLE)).toBe(true);
+    expect(darmanitan.isMoveRestricted(Moves.SPLASH)).toBe(false);
+  }, TIMEOUT);
+
+  it("should struggle if the only usable move is disabled", async () => {
+    await game.classicMode.startBattle([Species.GALAR_DARMANITAN]);
+
+    const darmanitan = game.scene.getPlayerPokemon()!;
+    const enemy = game.scene.getEnemyPokemon()!;
+
+    game.move.select(Moves.SPLASH);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(darmanitan.getStatStage(Stat.ATK)).toBe(1);
+    // Other moves should be restricted
+    expect(darmanitan.isMoveRestricted(Moves.TACKLE)).toBe(true);
+    expect(darmanitan.isMoveRestricted(Moves.SPLASH)).toBe(false);
+
+    // Turn where Tackle is interrupted by Disable
+    await game.toNextTurn();
+    game.override.enemyMoveset(Array(4).fill(Moves.DISABLE));
+
+    game.move.select(Moves.SPLASH);
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expect(enemy.hp).toBe(enemy.getMaxHp());
+
+    // Turn where Struggle is used
+    await game.toNextTurn();
+
+    game.move.select(Moves.TACKLE);
+    await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
+
+    await game.phaseInterceptor.to("MoveEndPhase");
+    expect(darmanitan.hp).toBeLessThan(darmanitan.getMaxHp());
+  }, TIMEOUT);
+});