Talk:Mewtwo/@comment-69.42.28.21-20120420035701/@comment-82.113.119.74-20120428201153

Nope. Mew and Mewtwo just randomly appear in the waves along with all the other Pokemon in the Unknown Dungeon level. They both are regular (not boss) and you catch them like every other pokemon in this game by damaging them till the health bar turns red and throwing your pokeball then.

You just need to be patient and make sure to bring a Gengar to get Mew/Mewtwo low enough in order to catch them.