Mewtwonite Y
One variety of the mysterious Mega Stones. Have Mewtwo hold it, and this stone will enable it to Mega Evolve during battle.
Items
Mega Evolution
1
The wiki does not say where to find Mewtwonite Y yet.
Every item in the PokédexOne variety of the mysterious Mega Stones. Have Mewtwo hold it, and this stone will enable it to Mega Evolve during battle.
The wiki does not say where to find Mewtwonite Y yet.
Every item in the Pokédex