How do you get Mewtwo in ssbm

there are different ways to do it. 1. you can spend two days doing 700 vs. matches with your best friend 2. you can play super long vs. matches that amount up to a total time of twenty hours. or 3. you can put controlers in slot 1,2, and 3, start a vs. match in the stage Pokemon stadium, put all three characters on the pokeball in the floor and wait....i hope that helps some