The curent moveset: Assault vest 252 Atk/252 Def/4 Hp -Rock Slide -Iron Head -Earthquake -Fire Punch
Iron Head.
It doesn't seem to have any role in Rhypherior's moveset as it doesn't cover any weaknesses so I would recommend replacing Iron Head with Stealth Rock.Oh and it is probably better to go with Ice Punch instead of Fire Punch.
Hope I helped!
