Blissey

Even the most ferocious Pokémon become calm when they eat Blissey's egg, which is said to be filled with happiness.

Ability — Fresh Egg: When you play this Pokémon from your hand to evolve 1 of your Pokémon during your turn, you may heal 80 damage from your Active Pokémon.

Double-Edge (160): This Pokémon does 80 damage to itself.