The complete Pokemon RBY pokedex, part 11

Pokémon Name: Rhydon
Type: Ground / Rock
Classification: Drill Pokemon
Pokédex Number: 112
Ability: Rock Head and Lightningrod
Dream World ability: Reckless
Useful Attacks: Megahorn
Location Found:
Diamond/Pearl: Routes 227 and 228, Stark Mountain
Platinum: Route 228, Stark Mountain, Victory Road
HG/SS: Evolve Rhyhorn
Black: Trade, Poke Transfer
White: Evolve Rhyhorn

Still strong, still tough and still slow as molasses. One more evolution after this makes Rhydon even more powerful. In a bizarre twist, this Ground/Rock Pokemon can also learn Surf via HM03. Also, the last four moves it learns are all different types, so if you're dedicated, you can have one versatile Pokemon on your hands.

Evolution: From Rhyhorn at 42, to Rhyperior via Protector