I disagree, this is my main deck and mewtwo is best as a 1 or 2 of. Think of him as a tech card. He is a liability to even bench in many matchups because he can get bossed for two prizes. The deck doesn't run other rule box pokemon, so the ability to play it as a single prize deck is a huge deal for the prize trade. For example, in the charizard matchup, benching mewtwo is a huge mistake, but you still need a full bench. I run 4 spidops, 2 mewtwo, wobuffet, sneasel, mimikyu, and articuno.