Politoed

Whenever three or more of these get together, they sing in a loud voice that sounds like bellowing.

Pokemon Power — Frog Song: Whenever Politoed's attack damages the Defending Pokémon (after applying Weakness and Resistance), if there are more than 3 Poliwags, Poliwhirls, Poliwraths, and/or Politoeds in play (including your opponent's), that attack does 40 more damage (no matter how many heads you get). This power stops working while Politoed is Asleep, Confused, or Paralyzed.

Doubleslap (40x): Flip 2 coins. This attack does 40 times the number of heads.