Mewtwonite Y

Mega Stone

What does Mewtwonite Y do in Pokemon X and Y?

• One of the mysterious Mega Stones. Have Mewtwo hold it, and this stone will enable it to Mega Evolve in battle
• Evolves Mewtwo into Mega Mewtwo Y during battle.

Where can I find Mewtwonite Y in Pokemon X and Y?

• Received by catching Mewtwo in the Unknown Dungeon (post-game - Y only)