Fixed interaction with instruct and dead mon redirection

src/data/move.ts

@@ -6108,7 +6108,7 @@ export class ForceSwitchOutAttr extends MoveEffectAttr {
         return false;
       }
 
-      // Don't allow wild mons to flee with U-turn et al
+      // Don't allow wild mons to flee with U-turn et al.
       if (this.selfSwitch && !user.isPlayer() && move.category !== MoveCategory.STATUS) {
         return false;
       }
@@ -7068,7 +7068,20 @@ export class RepeatMoveAttr extends MoveEffectAttr {
     // (mainly for alternating double/single battle shenanigans)
     // Rampaging moves (e.g. Outrage) are not included due to being incompatible with Instruct
     // TODO: Fix this once dragon darts gets smart targeting
-    const moveTargets = movesetMove.getMove().isMultiTarget() ? getMoveTargets(target, lastMove.move).targets : lastMove.targets!;
+    let moveTargets = movesetMove.getMove().isMultiTarget() ? getMoveTargets(target, lastMove.move).targets : lastMove.targets;
+
+    /** In the event the instructed move's only target is a fainted opponent, redirect it to an alive ally if possible
+    Normally, all yet-unexecuted move phases would swap over when the enemy in question faints
+    (see `redirectPokemonMoves` in `battle-scene.ts`),
+    but since instruct adds a new move phase pre-emptively, we need to handle this interaction manually.
+    */
+    const firstTarget = globalScene.getField()[moveTargets[0]];
+    if (globalScene.currentBattle.double && moveTargets.length === 1 && firstTarget.isFainted() && firstTarget !== target.getAlly()) {
+      const ally = firstTarget.getAlly();
+      if (ally.isActive()) { // ally exists, is not dead and can sponge the blast
+        moveTargets = [ ally.getBattlerIndex() ];
+      }
+    }
 
     globalScene.queueMessage(i18next.t("moveTriggers:instructingMove", {
       userPokemonName: getPokemonNameWithAffix(user),

src/test/moves/instruct.test.ts

@@ -43,7 +43,9 @@ describe("Moves - Instruct", () => {
   });
 
   it("should repeat target's last used move", async () => {
-    game.override.moveset(Moves.INSTRUCT);
+    game.override
+      .moveset(Moves.INSTRUCT)
+      .enemyLevel(1000); // ensures shuckle no die
     await game.classicMode.startBattle([ Species.AMOONGUSS ]);
 
     const enemy = game.scene.getEnemyPokemon()!;
@@ -170,6 +172,33 @@ describe("Moves - Instruct", () => {
     expect(enemyPokemon.getMoveHistory().length).toBe(1);
   });
 
+  it("should redirect attacking moves if enemy faints", async () => {
+    game.override
+      .battleType("double")
+      .enemyMoveset(Moves.SPLASH)
+      .enemySpecies(Species.MAGIKARP)
+      .enemyLevel(1);
+    await game.classicMode.startBattle([ Species.HISUI_ELECTRODE, Species.KOMMO_O ]);
+
+    const [ electrode, kommo_o ] = game.scene.getPlayerField()!;
+    game.move.changeMoveset(electrode, Moves.CHLOROBLAST);
+    game.move.changeMoveset(kommo_o, Moves.INSTRUCT);
+
+    game.move.select(Moves.CHLOROBLAST, BattlerIndex.PLAYER);
+    game.move.select(Moves.INSTRUCT, BattlerIndex.PLAYER_2, BattlerIndex.PLAYER);
+    await game.setTurnOrder([ BattlerIndex.PLAYER, BattlerIndex.PLAYER_2, BattlerIndex.ENEMY, BattlerIndex.ENEMY_2 ]);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    // Chloroblast always deals 50% max HP% recoil UNLESS you whiff
+    // due to lack of targets or similar,
+    // so all we have to do is check whether electrode fainted or not.
+    // Naturally, both karps should also be dead as well.
+    expect(electrode.isFainted()).toBe(true);
+    const [ karp1, karp2 ] = game.scene.getEnemyField()!;
+    expect(karp1.isFainted()).toBe(true);
+    expect(karp2.isFainted()).toBe(true);
+  }),
+
   it("should not repeat move when switching out", async () => {
     game.override
       .enemyMoveset(Moves.INSTRUCT)

src/test/utils/gameManager.ts

@@ -459,9 +459,9 @@ export default class GameManager {
   }
 
   /**
-   * Intercepts `TurnStartPhase` and mocks the getSpeedOrder's return value {@linkcode TurnStartPhase.getSpeedOrder}
+   * Intercepts `TurnStartPhase` and mocks {@linkcode TurnStartPhase.getSpeedOrder}'s return value.
-   * Used to modify the turn order.
+   * Used to manually modify Pokemon turn order.
-   * Note: This *DOES NOT* account for priority.
+   * Note: This *DOES NOT* account for priority, only speed.
    * @param {BattlerIndex[]} order The turn order to set
    * @example
    * ```ts
@@ -475,7 +475,7 @@ export default class GameManager {
   }
 
   /**
-   * Removes all held items from enemy pokemon
+   * Removes all held items from enemy pokemon.
    */
   removeEnemyHeldItems(): void {
     this.scene.clearEnemyHeldItemModifiers();