Mega Stone, Pokémon Wiki

Mega Stones (メガストーン, Mega Sutoon) are special stones that allow certain Pokémon to reach their Mega Evolution form. Certain Pokémon will be able to Mega Evolve when holding the respective Mega Stone or, in Pokémon: Let's Go, Pikachu! and Pokémon: Let's Go, Eevee!, having the respective Mega Stone present in the Bag. However, the Pokémon will revert into to their pre-Mega-Evolved form after the battle or when the Pokémon faints. Rayquaza is the only Pokémon that doesn't require a Mega Stone to ev

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