Mew Mewtwo Gardevoir

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