Volcarona-GX

Once during your turn (before your attack), you may discard a Energy card from your hand. If you do, put 2 damage counters on 1 of your opponent's Pokémon.

Backfire

160

Put 2 Energy attached to this Pokémon into your hand.

Massive Heat Wave GX

Discard an Energy from each of your opponent's Pokémon. (You can't use more than 1 gx_atk attack in a game.)