If you want to pack a serious psychic/fighting punch, Mega Mewtwo X is your man! He hits, and then vanishes. His incredible Vanishing Strike Attack will annihilate anything.
Mewtwo-EX (Blue)
[C][C] Photon Wave 30
During your opponent’s next turn, any damage done by attacks from the Defending Pokémon is reduced by 30 (before applying Weakness and Resistance).
[P][P][C][C] Psyburn 120
I rate this card a 3.5 star because of its amazing ability to stall.
M Mewtwo-EX (X)
[P][T][T][C] Vanishing Strike 150+
If there is any Stadium card in play, this attack does 50 more damage, and this attack’s damage isn’t affected by Resistance or any effects on your opponent’s Active Pokémon.
I rate this card a 4 star, because it is really powerful, but M Mewtwo-EX (Y) is better.
I rate the Mewtwo X line a 4 star in total.