Gyarados

Dragon Spark: This attack does 10 damage to each of your opponent's Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)

Full Retaliation (20x): Does 20 damage times the number of damage counters on all of your Magikarp.

Pulverize (20x): If the Defending Pokémon already has at least 2 damage counters on it, this attack does 50 damage plus 50 more damage.