Burned Tower, Pokémon Tower
Burned Tower, Pokémon Tower, Evolve Gastly (Lv25)
Pokémon Tower, Evolve Haunter (Lv40)
Route 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 21, 23, Celadon City, Mt. Moon, Rock Tunnel
Mt. Mortar (static), Route 9, 13, 14, 15, 17, 18, 21, 23, 30, 31, 32, 33, 42, 43, Cerulean Cave, Dark Cave, Ilex Forest, Mt. Mortar, Mt. Silver, Pokémon Tower, Rock Tunnel, Seafoam Islands, Sky Pillar, Slowpoke Well, Tohjo Falls, Union Cave, Victory Road, Evolve Zubat (Lv22)
Mt. Mortar (static), Tohjo Falls, Union Cave, Evolve Golbat (Lv40)