Solid Rock is its ability obviously. This was the second Rhyperior because te first had LightningRod (that guy is still in my PC, nobody wants a LightningRod Rhyperior. Plus, he is there for memories. That guy has Rock Wrecker.) Rhyperior can either be defensive or Offensive. I choose for mine offensive because that is what I am. My good Rhyperior, the one who I sometimes use, knows:
Stone Edge: High power, good chance for a critical hit, STAB, type coverage. Used to deal with Ice types.
Earthquake: From here on, I'm not going to list reasons for this move.
Megahorn: High power, used to deal with Grass types.
Avalanche: Deals with Ground types and Grass types, high accuracy and usually high power, otherwise decent power. Works well because Rhyperior is SLOOOOOW. Also deals with the ever popular Dragon type.
Rhyperior learnset