Drag Off20

Before doing damage, choose 1 of your opponent's Benched Pokemon and switch it with the Defending Pokemon. Do the damage to the new Defending Pokemon. This attack can't be used if your opponent has no Benched Pokemon.

Knock Back30

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.)