MEDIOCRE
Animation was decent, not great. Tweens were decently implemented. The art was sub-par, nothing that won't improve with practice though.
Action was pretty poor. Choreograph more thoroughly, fights should have more than two or three actions. I get that you were trying to convey how powerful mewtwo was but you didn't build it up enough in the beginning to be exciting.
Playing the invincibility track over the main theme was absolutely terrible. Two tracks at once is always awful. Come on, man.
And just my personal opinion, it's hard to take anything with "swag" in the title seriously.