Rhydon (Japanese: サイドン Sidon) is a dual-type Ground/Rock Pokémon introduced in Generation I. It evolves from Rhyhorn starting at level 42 and evolves into Rhyperior when traded while holding a Protector.
Rhydon is a large, gray, bipedal Pokémon with features similar to both dinosaurs and rhinoceroses. It has narrow, red eyes and two fangs in its upper jaw. On the tip of Rhydon's snout is a cream-colored horn, which is smaller on a female than on a male. There are several other spikes and projections on its head: on top is a spike that curves forward, two triangular points resembling ears on the sides, a wide, wavy crest under each ear, and spiky ridges on each cheek. It has a cream-colored abdomen divided into strips by thin divots. A rocky plate on its chest slightly overlaps its abdomen. There is a row of spikes down its back and they have a long tail with thin, black stripes.