It evolves by level, not stone
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Hippopotas evolves into a Hippowdon.
Hippopotas evolves at Level 34.
You must evolve a Hippopotas.
A Hippopotas evolves at Level 34 in Pokémon Platinum. If you want a website to see what level Pokemon evolve, try Serebii.net
You have to let it evolve from a Hippopotas, which you can find at the Ruin Maniac's Cave