diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 09a1e962cf0..53d4b6c54d2 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -1226,10 +1226,15 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
   /**
    * Checks if the {@linkcode Pokemon} has is the specified {@linkcode Species} or is fused with it.
    * @param species the pokemon {@linkcode Species} to check
+   * @param formKey If provided, requires the species to be in that form
    * @returns `true` if the pokemon is the species or is fused with it, `false` otherwise
    */
-  hasSpecies(species: Species): boolean {
-    return this.species.speciesId === species || this.fusionSpecies?.speciesId === species;
+  hasSpecies(species: Species, formKey?: string): boolean {
+    if (Utils.isNullOrUndefined(formKey)) {
+      return this.species.speciesId === species || this.fusionSpecies?.speciesId === species;
+    }
+
+    return (this.species.speciesId === species && this.getFormKey() === formKey) || (this.fusionSpecies?.speciesId === species && this.getFusionFormKey() === formKey);
   }
 
   abstract isBoss(): boolean;
diff --git a/src/ui/command-ui-handler.ts b/src/ui/command-ui-handler.ts
index 5eb5588a9bf..20cffbbe30a 100644
--- a/src/ui/command-ui-handler.ts
+++ b/src/ui/command-ui-handler.ts
@@ -10,6 +10,7 @@ import { globalScene } from "#app/global-scene";
 import { TerastallizeAccessModifier } from "#app/modifier/modifier";
 import { Type } from "#app/enums/type";
 import { getTypeRgb } from "#app/data/type";
+import { Species } from "#enums/species";
 
 export enum Command {
   FIGHT = 0,
@@ -180,7 +181,8 @@ export default class CommandUiHandler extends UiHandler {
 
   canTera(): boolean {
     const hasTeraMod = !!globalScene.getModifiers(TerastallizeAccessModifier).length;
-    const isBlockedForm = globalScene.getField()[this.fieldIndex].isMega() || globalScene.getField()[this.fieldIndex].isMax();
+    const activePokemon = globalScene.getField()[this.fieldIndex];
+    const isBlockedForm = activePokemon.isMega() || activePokemon.isMax() || activePokemon.hasSpecies(Species.NECROZMA, "ultra");
     const currentTeras = globalScene.arena.playerTerasUsed;
     const plannedTera = globalScene.currentBattle.preTurnCommands[0]?.command === Command.TERA && this.fieldIndex > 0 ? 1 : 0;
     return hasTeraMod && !isBlockedForm && (currentTeras + plannedTera) < 1;