you can find hippowdon on route 228
Route 228
You catch Hippowdon at Route 228 where the sand is and you catch hipportas at route 224 in the ruin maniac cave which evolves to Hippowdon at lv34
Sorry, but Hippowdon is the same in all the games. To evolve Hippopotas, level it to Lvl. 34.
D/P Quagsire Hippowdon Sudowoodo Whiscash Golem Platinum Gliscor Hippowdon Rhyperior Whiscash Golem
you need the nashinol pokedex then go to the fight area(the boat in snowpoint city) and go to route228 and find a hippowdon!! i know because i have a hippowdon! this works! thx
Go to Route 214 and go in the ruin maniac cave.
You can 1.Breed an Hippowdon to have an egg or 2.Catch all the 26 unowns and go in the cave on route 214 and you should find an Hippopotas.
1 way to get hippopotas in platinum is to catch every single unown ( abcdefghijklmnopqrstuvwxyz?! ) then go to the ruin maniac's cave and you will see one and be able to catch it. Another way is to catch a hippowdon and breed it with a ditto or another gender hippowdon. get the egg and hatch, you have a lv. 1 hippopotas. The last way would be to find a trainer that has one. If you use Action Replay DS and if you have the cheat, catch trainer's pokemon, you can find that trainer and steal his hippopotas.
The room where you find the springy grass
in the hippowdon temple
Hippowdon temple by the springy grass
Just get both! On diamond/pearl/platinum go to jubilife city, go to the GTS and search for the two.