Pokémon
Mewtwo ex x2
Mew ex x1
Ralts x2
Kirlia x2
Gardevoir x2
Trainers
X Speed x1
Poké Ball x2
Mythical Slab x2
Professor's Research x2
Sabrina x1
Blue x1
Leaf x1
Giovanni x1
Strategy
Gardevoir to gather energy for Mew/Mewtwo
Use item cards and Professor card to gather the Pokémon you want, the priority order to use (I think) should be: Poke Ball, Professor's Research, Mythical Slab
Depending on active pokémon of opponent you use either Mew or Mewtwo, example: if your opponent has Charizard, you can use Mew to copy its attac and kill it in one hit
You can use Mewtwo EX both as tank (use Leaf when it is close to die) and also to attack
You can use Sabrina to force your opponent to put the pokemon you want to copy the attack and then use Mew