Key Stone/Anime/PO

In File 2: Cubone, after helping drive off driving Team Rocket out of the Pokémon Tower and helping find peace,  received a Key Stone and a Charizardite X from Mr. Fuji. The Key Stone and Mega Stone activated in File 4: Charizard during Red's showdown with, Mega Evolving his trusted starter Pokémon, , into Mega Charizard X and giving them the strength to weaken Mewtwo so that Red could catch it. This Key Stone was not worn in any accessory.