Gyarados 8

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

Does 20 damage times the number of damage counters on all of your Magikarp. Damage: 20×

If the Defending Pokémon already has at least 2 damage counters on it, this attack does 50 damage plus 50 more damage. Damage: 50+