The fight was very... lackluster. Other than being very short, there really wasn't any reason to bring back Shadow to fight Mewtwo other than to make the joke that they're both "ultimate life-forms".
Getting off-topic there, whoops.
Anyway, I'm pretty excited for the next fight. Correct me if I'm wrong, but don't Carolina and the Meta have almost the same armor enhancements? If so, then this is gonna be one hell of a fight.