Mewtwonite X (Mega Stone)
Location Given after going to the second floor of any Pokémon Center and entering the following Mystery Gift password: 6ZT5ZX7RN4KK. The Mewtwo you receive will be holding the stone.
Mega Evolution Mewtwo (X)

Prerequisites

Location

After defeating the Pokémon League and becoming the Champion, go to any Pokémon Center and climb the west stairs.

Climbing the stairs in the Pokémon Center. / Pokémon Unbound
Climbing the stairs in the Pokémon Center.

Interact with the NPC wearing green clothes and standing behind the west counter.

Interacting with the green-clothed NPC. / Pokémon Unbound
Interacting with the green-clothed NPC.

Select “Yes” when asked if you want to receive a mystery gift.

Saying yes to receiving a mystery gift. / Pokémon Unbound
Saying yes to receiving a mystery gift.

Enter the following password in the textbox that pops up: 6ZT5ZX7RN4KK

Entering the password to acquire a Mewtwo. / Pokémon Unbound
Entering the password to acquire a Mewtwo.

When entered correctly, this password will give you a Mewtwo holding the Mewtwonite X mega stone.

Receiving the Mewtwonite X from the Mewtwo. / Pokémon Unbound
Receiving the Mewtwonite X from the Mewtwo.
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