I'm making a Mega Aggron set up. Adament nature, max Attack and Speed evs. Rock Polish, Rock Slide, Earthquake, and . Which should I use, Heavy Slam or Iron Head? Mega Aggron weighs 395 kg, so Heavy Slam would have as much or more power as Iron Head if the opponent weighed 100 kg or less, but can't flinch, and gets weaker against super heavy pokemon.