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)
Route 29, 30, 31, Hidden Forest, Evolve Ledyba (Lv18)