Nintendo Japan has revealed the new Nintendo 3DS themes and POKéMON 151 Mewtwo and Pokémon Mega Mewtwo & BREAK Evolution Pokémon (ポケモンメガミュウツー&BREAK進化ポケモン) were announced. These themes cost 200yen each and are available for purchase as of September 16th, 2015 on the Nintendo 3DS eShop store.
Pokémon Mega Mewtwo & BREAK Evolution Pokémon (ポケモンメガミュウツー&BREAK進化ポケモン)
Features: Mega Mewtwo X and Mega Mewtwo Y powerfully collide in this dynamic theme that celebrates the release of the Pokémon Card Game XY BREAK evolution mechanic. The lower screen features the gold bodied Pokémon. Music:XY - Battle! Mewtwo (~戦闘!ミュウツー~)
POKéMON 151 Mewtwo
Features: This theme features Mewtwo and Mew and its design and features are accented in a stylish way that highlights the POKéMON 151 line of products. Music:XY - The Master Tower (~マスタータワー~)