diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 6075d944772..67b01fb8fdb 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -2981,8 +2981,8 @@ export default class BattleScene extends SceneBase {
    */
   getActiveKeys(): string[] {
     const keys: string[] = [];
-    const activePokemon: (PlayerPokemon | EnemyPokemon)[] = this.getParty();
-    activePokemon.concat(this.getEnemyParty());
+    let activePokemon: (PlayerPokemon | EnemyPokemon)[] = this.getParty();
+    activePokemon = activePokemon.concat(this.getEnemyParty());
     activePokemon.forEach((p) => {
       keys.push(p.getSpriteKey(true));
       if (p instanceof PlayerPokemon) {
diff --git a/src/battle.ts b/src/battle.ts
index 12d02553ba1..0356772bb07 100644
--- a/src/battle.ts
+++ b/src/battle.ts
@@ -233,7 +233,7 @@ export default class Battle {
     const wildOpponents = scene.getEnemyParty();
     for (const pokemon of wildOpponents) {
       if (this.battleSpec === BattleSpec.FINAL_BOSS) {
-        if (pokemon.species.getFormSpriteKey() === SpeciesFormKey.ETERNAMAX) {
+        if (pokemon.species.getFormSpriteKey(pokemon.formIndex) === SpeciesFormKey.ETERNAMAX) {
           return "battle_final";
         }
         return "battle_final_encounter";
@@ -299,7 +299,7 @@ export default class Battle {
               return "battle_legendary_sinnoh";
             case Species.DIALGA:
             case Species.PALKIA:
-              if (pokemon.species.getFormSpriteKey() === SpeciesFormKey.ORIGIN) {
+              if (pokemon.species.getFormSpriteKey(pokemon.formIndex) === SpeciesFormKey.ORIGIN) {
                 return "battle_legendary_origin_forme";
               }
               return "battle_legendary_dia_pal";