Garchomp & Giratina GX (Secret) #247/236

Calamitous Slash160+

If your opponent's Active Pokémon already has any damage counters on it, this attack does 80 more damage.

Discard 1 of your opponent's Pokémon and all cards attached to it. If this Pokémon has at least 3 extra Fighting Energy attached to it (in addition to this attack's cost), discard 2 of your opponent's Pokémon instead. (You can't use more than 1 GX attack in a game.)