Rhyperior is a large, dark brown Pokémon with two horns: one on its nose, and another one above it. It has a club-like tail and its hide is partially covered by orange, rocky plates. It has blade-like protrusions on its elbows and has holes in the palms of its hands which works as a cannon or a gun. Rhyperior can insert rocks and boulders into its arms through the holes in its hands and then fire them like bullets. However, it will occasionally insert and fire Geodude by accident. It also appears to have two thick, rectangular rocks above its eyes, resembling heavy eyebrows. Rhyperior lives far up in the mountains.
The upper horn is smaller on a female Rhyperior.
Rhyperior is the evolved form of Rhydon. A Rhydon can only evolve into a Rhyperior by trade while holding the Protector item.