Where to find Marill in Diamond, Pearl & Platinum

Walk: Great Marsh (30%, Great Marsh rotation, Before the National Dex, Only in Diamond & Pearl), Sinnoh Route 212 (24%, Only in Platinum), Sinnoh Route 215 (20%, Only in Platinum) + 1 more
Surf: Great Marsh (30%, Only in Diamond & Pearl)

• Great Marsh (1) — Surf, Walk
• Route 212 — Walk
• Route 215 — Walk
• Trophy Garden (Trophy Garden) — Walk

Marill in every game · Pokémon Diamond, Pearl & Platinum interactive map (Sinnoh)