You can catch one at the Ruin Maniac's cave, which is just south of Veilstone City. You have a 5% rate of meeting it, but don't worry, because the Pokemon that are available there are only Hippopotas, Zubat and Geodude, so the 5% is actually a lot. The rate of meeting Hippopotas increases if you have more Unown, but you can also catch one without any Unowns.
A Hippopotas evolves at Level 34 in Pokémon Platinum. If you want a website to see what level Pokemon evolve, try Serebii.net
no trainer has it and you will have to hope for luck if you find hippopotas
Hippopotas evolves into Hippowdon at Level 34.
Hippopotas is a Ground type pokemon.
Hippopotas evolves into a Hippowdon.
Hippopotas evolves at Level 34.
Hippopotas evolves at 34 into Hiooowdon
Hippopotas is #449 in the national pokedex, and it is a Ground type Pokemon.
Hippopotas is known as the hippo pokémon. Hippopotas can be found in the Ruins Maniac's Tunnel or the Ruins Maniac's Cave. The Hippopotas at the Tunnel will be between the levels 22-25 and the Hippopotas from the Cave 22 or 23.
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.
level 34