Gumshoos GX 
2 in stock.
Set: SM Base Set Type: Colorless Rarity: Ultra rare Retreate Cost: 2 Headbutt Bounce (100) Gumshoe Chance GX (10+)
This attack does 50 more damage times the amount of Energy attached to your opponent's Active Pokemon. (You can't use more than 1 GX attack in a game.)