Meganium

As long as Meganium is your Active Pokémon, remove 1 damage counter from each Pokémon (excluding Pokémon-ex) (both yours and your opponent's) between turns.

You may put up to 5 damage counters on Meganium. If you do, this attack does 50 damage plus 10 more damage for each damage counter you put on Meganium in this way.