Where to find Gastly in Diamond, Pearl & Platinum

Walk: Old Chateau (100%), Lost Tower (84%, Poké Radar, Dual-slot bonus), Turnback Cave (30%, Only in Platinum) + 2 more

• Eterna Forest — Walk
• Lost Tower (1F, 2F, 3F, 4F, 5F) — Walk
• Old Chateau (Back East Room, Back Middle East Room, Back Middle Room, Back Middle West Room, Back West Room, Corridor, Dining Area, Old Chateau, Side Rooms) — Walk
• Route 209 — Walk
• Turnback Cave — Walk

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