Whirlwind (20)
If your opponent has any Benched Pokemon, he or she chooses 1 of them and switches it with the Defending Pokemon. (Do the damage before switching the Pokemon.)
[GGGG] Mega Drain (40)
Remove a number of damage counters from Butterfree equal to half the damage done to the Defending Pokemon (after applying Weakness and Resistance) (rounded up to the nearest 10).