Meganium

Meganium's breath has the power to revive dead grass and plants. It can make them healthy again.

Ability — Overgrow: If this Pokémon's remaining HP is 50 or less, its attacks do 70 more damage to your opponent's Active Pokémon (before applying Weakness and Resistance).

Green Force (50): Heal from this Pokémon the same amount of damage you did to your opponent's Active Pokémon.