Bounce Off20

If Magneton and the Defending Pokemon don't have the same number of Energy cards attached to them, the player controlling the Active Pokemon with the fewest number of Energy cards attached to it switches 1 of his or her Benched Pokemon with his or her Active Pokemon.

Magnetic Wave30+

This attack does 30 damage plus 10 damage times the number of your Benched Pokemon minus the number of your opponent's Benched Pokemon. (For example, if your opponent has 1 Benched Pokemon and you have 3, this attack will do 30 damage plus 20 more damage.)