maniac tunnel, south of veilstone.
there is no such thing as a hippopotamus in pearl I think the question was supposed to be: "How do you get Hippopotas in Pokemon Pearl?" The answer is: You find it in Maniac Tunnel.
You have to let it evolve from a Hippopotas, which you can find at the Ruin Maniac's Cave
go to veilstone city go down till you see a cave go in and walk around for a little bit.
Hippopotas is a Ground type pokemon.
if you look around in 'ruin maniac's cave' you can find hippopotas , or you can breed a hippodown.
To get hippopotas in heartgold and soulsilver you need to go to safari zone and use special items.
ruin maniac's cave route 214 near veilstone city
Hippopotas is in Ruin Maniac's Cave.
in the ruin maniacs cave just down from veilstone city. tough to find tho in the ruin maniacs cave just down from veilstone city. tough to find tho
you can get Hippopotas in the maniac ruins. you go to veilstone and go down to route 214 and there is a cave. you have to catch some unown in the solaceon ruins first or he wont be far enough.
Hippopotas evolves into a Hippowdon.
Hippopotas evolves at Level 34.