Leftovers is an, albeit minor, issue, and the "more power" doesn't really hold water until you're fighting a Steel-type that can damage Magnezone after a Magnet Rise just in case it happens to get one up. Magnezone's role, at least in the Bet you wish you had Shed Shell now, huh? Set, which is what I was talking about Magneton being better in, Is to pick away at most steel. Magneton still has plenty of power. You aren't going to use choice items on the Bet you wish you had Shed Shell now, huh? Set, and Magnezone is better at Choice items and other stuff, but if you're not gimmicking with your Steel trapping, Magneton is better, if only because of its defenses and speed, essential for getting it to perhaps be lucky enough to get Magnet Rise against users of Ground moves, that aren't Doryuzu, where it won't matter if you're as fast as you can be, anyway. And maybe, just maybe, Magneton might have a better chance of surviving that Earthquake.