Thread:DespicableDarion/@comment-16072884-20140619124031

Mewtwo can be unlocked by playing matches for at least 20 hours. To unlock him, just play a stock match with two human players, no items, on Battlefield or another stage without stage hazards. Leave the game turned on for at least 20 hours (overnight or something). Then after 20 hours, you can KO one of the characters, and after you win the match you'll be able to fight Mewtwo. 