diff --git a/src/data/move.ts b/src/data/move.ts
index 5c64286d5c6..9d969e44f1b 100755
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -184,8 +184,6 @@ export default class Move implements Localizable {
     return this;
   }
 
-  isRetaliate = () => {};
-
   addAttr(attr: MoveAttr): this {
     this.attrs.push(attr);
     let attrCondition = attr.getCondition();
@@ -6549,9 +6547,9 @@ export function initMoves() {
       .attr(CopyTypeAttr),
     new AttackMove(Moves.RETALIATE, Type.NORMAL, MoveCategory.PHYSICAL, 70, 100, 5, -1, 0, 5)
       .attr(MovePowerMultiplierAttr, (user, target, move) => (
-        user.scene.currentBattle.turn - user.scene.currentBattle.playerFaintsHistory.slice(-1)[0].turn === 1 &&
+        user.scene.currentBattle.turn - user.scene.currentBattle.playerFaintsHistory.at(-1).turn === 1 &&
         user instanceof PlayerPokemon ||
-        user.scene.currentBattle.turn - user.scene.currentBattle.enemyFaintsHistory.slice(-1)[0].turn === 1 &&
+        user.scene.currentBattle.turn - user.scene.currentBattle.enemyFaintsHistory.at(-1).turn === 1 &&
         user instanceof EnemyPokemon) ? 2 : 1),
     new AttackMove(Moves.FINAL_GAMBIT, Type.FIGHTING, MoveCategory.SPECIAL, -1, 100, 5, -1, 0, 5)
       .attr(UserHpDamageAttr)