Ancient Origins set of XY series

Gyarados
Stage 1
HP130
Evolves From: Magikarp
Pokédex No.130
Full Retaliation
This attack does 30 more damage for each damage counter on each of your Benched Magikarp.
Thrash
Flip a coin. If heads, this attack does 30 more damage. If tails, this Pokémon does 30 damage to itself.