diff --git a/src/data/pokemon-forms.ts b/src/data/pokemon-forms.ts
index 55e21ae928b..a67a09df74a 100644
--- a/src/data/pokemon-forms.ts
+++ b/src/data/pokemon-forms.ts
@@ -115,7 +115,10 @@ export class SpeciesFormChange {
       formIndexes.push(pokemon.fusionFormIndex);
     }   
 
-    const formMatch = [true, true];
+    const formMatch = [true];
+    if (pokemon.isFusion())
+      formMatch.push(true);
+
     for (let i = 0; i < speciesArray.length; ++i) {
       const species = speciesArray[i];
       const formIndex = formIndexes[i];
diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 2df8748a9fa..886e2f12f70 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -1660,8 +1660,15 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
   }
 
   changeForm(formChange: SpeciesFormChange): Promise<void> {
+    const matchesBase = this.species.speciesId == formChange.speciesId;
+
     return new Promise(resolve => {
-      this.formIndex = Math.max(this.species.forms.findIndex(f => f.formKey === formChange.formKey), 0);
+      const newFormIndex = Math.max((matchesBase ? this.species : this.fusionSpecies).forms.findIndex(f => f.formKey === formChange.formKey), 0);
+      if (matchesBase)
+        this.formIndex = newFormIndex;
+      else
+        this.fusionFormIndex = newFormIndex;
+
       this.generateName();
       const abilityCount = this.getSpeciesForm().getAbilityCount();
       if (this.abilityIndex >= abilityCount) // Shouldn't happen