What makes the Mewtwo ex deck so powerful is what you play alongside it; the Mewtwo ex deck is a slow-building one, requiring some luck to build a Ralts up to a Gardevoir to boost the amount of ...

Add standard Mewtwo, Jynx, or Kangaskhan to improve the deck's win rate significantly. The ultimate Mewtwo EX deck includes Ralts, Kirlia, Gardevoir, and specific item cards for a 60% win rate.