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)
Vermillion City (trade), Route 4, 10, 12, 13, 14, 15, 17, 19, 22, 23, 24, Boon Island, Cerulean Cape, Cerulean Cave, Cerulean City, Chrono Island, Cinnabar Island, Crimson City, Dark Cave, Pallet Town, Ruins of Alph, Safari Zone A1, A2, A3, A4, A5, Seafoam Islands, Slowpoke Well, Tohjo Falls, Treasure Beach, Vermillion City, Viridian River
Mt. Mortar (static), Bond Bridge, Cerulean Cave, Safari Zone A1, A2, A3, A4, A5, Seafoam Islands, Slowpoke Well, Tohjo Falls, Treasure Beach, Evolve Slowpoke (Lv37)
Slowpoke Well, Evolve Slowpoke (Water Stone or King's Rock)