Kanto Daycare (gift), Viridian Forest
Route 6, 7, Hidden Forest, Power Plant, Evolve Pichu (Lv15)
Cerulean Cave, Evolve Pikachu (Thunder Stone)
Route 4, 10, 12, 17, 18, 22, 23, 24, Cerulean Cape, Cerulean Cave, Cerulean City, Cherrygrove City, Crimson City, Dark Cave, Mt. Mortar, Pallet Town, Safari Zone A1, A2, A3, A4, A5, Slowpoke Well, Tohjo Falls, Union Cave, Vermillion City, Viridian River
Deep Sea (static), Route 4, 10, 12, 17, 18, 23, Cerulean Cave, Cerulean City, Cherrygrove City, Crimson City, Dark Cave, Deep Sea, Mt. Mortar, Safari Zone A1, A2, A3, A4, A5, Tohjo Falls, Union Cave, Vermillion City, Viridian River, Evolve Goldeen (Lv33)