in pokemon diamond you can get a black hippowdon only if you have a female hippopotas and you evolve it at level 34 because a male hippopotas is brown while the female is black
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A shiny hippowdon. [EDIT] Turns out it's not shiny. The female Hippowdons are black, while the males are tan. Shiny ones have a greenish tint.
Some Pokemon have different sprites due to their gender e.g. a female Pikachu has a heart tail whilst a male one has a straight edged one, this black Hippowdon is like this as it is female, the yellow Hippowdon you are referring to is a male.
Hippowdon is a Ground type pokemon.
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
Hippowdon is a Ground-type Pokémon and is weak against Water, Grass and Ice.