Mewtwonite Y

	Pokémon Global Link artwork
	Introduced in Generation VI
Pocket
Generation VI	Items
Generation VII	Items
Fling
Power	80

The Mewtwonite Y (Japanese: ミュウツナイトY Mewtwonite Y) is a type of held item introduced in Generation VI. It is one of the Mega Stones associated with Mewtwo.

In the core series games

Price

Games	Cost	Sell price
XY ORAS SM USUM	N/A	N/A

Effect

In battle

If held by a Mewtwo, allows it to Mega Evolve into Mega Mewtwo Y if its Trainer has a Key Stone. Each Trainer can only Mega Evolve one Pokémon per battle.

Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot give Mewtwo a Mewtwonite Y or remove a Mewtwonite Y from Mewtwo.

Outside of battle

If held by a Mewtwo, allows it to Mega Evolve into Mega Mewtwo Y when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Mewtwo will remain a Mega Mewtwo Y until the Talent Round ends.

Description

Games	Description
XY	One variety of the mysterious Mega Stones. Have Mewtwo hold it, and this stone will enable it to Mega Evolve during battle.
ORAS SM USUM	One of a variety of mysterious Mega Stones. Have Mewtwo hold it, and this stone will enable it to Mega Evolve during battle.

Acquisition

Games	Finite methods	Repeatable methods
XY	Unknown Dungeon^Y (after catching Mewtwo)
ORAS	Littleroot Town (next to Birch's lab, after defeating or capturing Groudon^OR/Kyogre^AS)
SM	Event (Mewtwo Mega Stones)
USUM		Battle Tree (64 BP)

In the manga

Mewtwonite X and Y in Pokémon Adventures

In the Pokémon Adventures manga

Blaine obtained a Mewtwonite X and Mewtwonite Y sometime before Yveltal Steals of the X & Y arc. When partnered with Mewtwo, it can Mega Evolve into either of its Mega Evolutions interchangeably.

In other languages

Language		Title
Chinese	Cantonese	超夢進化石Ｙ Chīumuhng Jeunfa Sehk Y
Chinese	Mandarin	超夢進化石Ｙ / 超梦进化石Ｙ Chāomèng Jìnhuà Shí Y
French		Mewtwoïte Y
German		Mewtunit Y
Italian		Mewtwoite Y
Korean		뮤츠나이트X Mewtwonite Y
Spanish		Mewtwoita Y

External links

On Smogon's Itemdex:
- Generation VI
- Generation VII
On Eevee's Itemdex

This item article is part of Project ItemDex, a Bulbapedia project that aims to write comprehensive articles on all items.