East Province (Area One), East Province (Area Three), East Province (Area Two), South Province (Area Four), South Province (Area One), South Province (Area Three), West Province (Area One), West Province (Area Three), West Province (Area Two) — 9 locations on the interactive map.
Apple Hills, Mossfell Confluence, Oni Mountain, Paradise Barrens, Wistful Fields — 5 locations on the interactive map.
Pokémon Tower — 1 location on the interactive map.
Bell Tower, Route 31, Route 32, Route 36, Sprout Tower — 5 locations on the interactive map.
Gastly → Haunter (Level 25) → Gengar (Trade)