diff --git a/src/data/abilities/ability.ts b/src/data/abilities/ability.ts
index 120d1d413c4..0846d5602cc 100644
--- a/src/data/abilities/ability.ts
+++ b/src/data/abilities/ability.ts
@@ -3903,7 +3903,7 @@ export class PostSummonTransformAbAttr extends PostSummonAbAttr {
     const targets = pokemon.getOpponents();
     const target = this.getTarget(targets);
 
-    if (target.summonData.illusion) {
+    if (target?.summonData?.illusion || pokemon?.isTransformed() || target?.isTransformed()) {
       return false;
     }
 
diff --git a/src/data/moves/move.ts b/src/data/moves/move.ts
index f94c59bb463..066114e6aca 100644
--- a/src/data/moves/move.ts
+++ b/src/data/moves/move.ts
@@ -7610,14 +7610,13 @@ export class SuppressAbilitiesIfActedAttr extends MoveEffectAttr {
  */
 export class TransformAttr extends MoveEffectAttr {
   override apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    if (!super.apply(user, target, move, args)) {
+    if (!super.apply(user, target, move, args) || (target.isTransformed() || user.isTransformed())) {
+      globalScene.phaseManager.queueMessage(i18next.t("battle:attackFailed"));
       return false;
     }
 
     globalScene.phaseManager.unshiftNew("PokemonTransformPhase", user.getBattlerIndex(), target.getBattlerIndex());
 
-    globalScene.phaseManager.queueMessage(i18next.t("moveTriggers:transformedIntoTarget", { pokemonName: getPokemonNameWithAffix(user), targetName: getPokemonNameWithAffix(target) }));
-
     return true;
   }
 }
diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index e9cc4f70d70..deeffd736e8 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -1062,6 +1062,10 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     return species;
   }
 
+  isTransformed(): boolean {
+    return this.summonData.speciesForm !== null;
+  }
+
   /**
    * @param {boolean} useIllusion - Whether we want the fusionSpeciesForm of the illusion or not.
    */