Steam Siege set of XY series

Ampharos
Stage 2
HP140
Evolves From: Flaaffy
Pokédex No.181
AbilityShocking Light
Once during your turn (before your attack), you may put 3 damage counters on 1 of your opponent's Pokémon-EX.
Gigavolt
Flip a coin. If heads, this attack does 40 more damage. If tails, your opponent's Active Pokémon is now Paralyzed.