Where to catch Donphan

In Paldea (Scarlet & Violet)

• Asado Desert — Walk
• South Province (Area Four) — Walk
• West Province (Area Two) — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Mt. Silver — Walk
• Mt. Silver Cave — Walk
• Route 28 — Walk
• Route 45 — Walk

Donphan — full Pokédex entry