The complete Pokemon Diamond and Pearl pokedex, part 6

Pokémon Name: Hippowdon
Type: Ground
Classification: Heavyweight
Pokédex Number: 123 Sinnoh / 450 National
Abilities: Sand Storm – Creates a sand storm when entering battle
Dream World ability: Sand Force – Rock, Ground and Steel-type attacks get 30% power boost during sandstorms and gives user immunity to sandstorm damage
Useful Attacks: Earthquake
Location Found:
D/P/P: Route 228
D/P/P/HG/SS: Evolve from Hippopotas
B/W: Evolve Hippopotas

The googly-eyed Hippopotas evolves into this sand-spewing monster of a Pokémon, a formidable Ground-type. Sand pours from the holes on Hippowdon's back, creating a devastating sandstorm wherever it goes. In addition to a number of powerful Ground attacks, Hippowdon can also learn all of the elemental fang attacks with the help of Pastoria City's Move Relearner. As its size would indicate, Hippowdon is slow but equipped with HP to spare.