Where to find Haunter in Diamond, Pearl & Platinum

Walk: Turnback Cave (90%), Old Chateau (8%, Dual-slot bonus, Only in Diamond & Pearl)
Trade: Snowpoint City

• 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
• Snowpoint City — Trade
• Turnback Cave (Pillar 1 (Room 1), Pillar 1 (Room 3), Pillar 1 (Room 5)) — Walk

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