Hippowdon locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 20 — Walk

In Hisui (Legends: Arceus)

• Celestica Trail — Walk
• Gapejaw Bog — Walk
• Scarlet Bog — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 228 — Walk

Other games (4)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 228
• Sword / Shield (Gen 8): Dusty Bowl, Route 8, Galar Route 8, Giant's Mirror, Lake of Outrage
• Ultra Sun / Ultra Moon (Gen 7): Ultra Space Wilds
• Black 2 / White 2 (Gen 5): Desert Resort

Hippowdon — full Pokédex entry