On the Rampardos (
http://www.smogon.com/dp/pokemon/rampardos) Trick Room set there is a small error to where I think the writer of that set confused Rhyperior with Rampdardos, although I could be wrong.
Quote:
Trick Room
...Earthquake and Zen Headbutt hit most of the Pokémon that resist Head Smash for super-effective damage, other than Grounds, but Rhyperior has no real way of hitting those outside of Ice Beam. ...
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So yeah, basically change it to "Rampardos" or "it" if it was supposed to refer to Rampardos and your good I guess. Hope that helped ^^.