Pineco

It likes to make its shell thicker by adding layers of tree bark. The additional weight doesn't bother it.

Burst (40): Flip a coin. If heads, Pineco does 40 damage to itself and 10 damage to each Pokémon on each player's Bench. (Don't apply Weakness and Resistance for Benched Pokémon.) Flip a coin. If tails, this attack does nothing (not even damage).