Route 5 (trade), Route 2, 4, 7, 10, 12, 13, 14, 15, 17, 19, 20, 21, 22, 23, 24, 30, 31, 35, 43, 44, Blackthorn City, Cerulean Cape, Cerulean Cave, Cerulean City, Cinnabar Island, Crimson City, Ilex Forest, Mt. Silver Base, Pallet Town, Ruins of Alph, Safari Zone A1, A2, A3, A4, A5, Treasure Beach, Vermillion City, Violet City, Viridian River
Route 6, 8, 14, 15, 22, 23, 24, 30, 31, 35, 43, 44, Blackthorn City, Cerulean Cape, Cherrygrove City, Crimson City, Ilex Forest, Mt. Silver Base, Pallet Town, Safari Zone A1, A2, A3, A4, Violet City, Evolve Poliwag (Lv25)
Route 30, 31, 35, 43, Cherrygrove City, Ilex Forest, Mt. Silver Base, Violet City, Evolve Poliwhirl (Water Stone)
Route 30, 31, 35, 43, Ilex Forest, Mt. Silver Base, Violet City, Evolve Poliwhirl (Lv37 or King's Rock)
Route 4, 10, 12, 13, 17, 19, 20, 21, Bond Bridge, Boon Island, Brine Road, Cerulean City, Chrono Island, Cinnabar Island, Kin Island, Offshore Road, P2 Laboratory, Resort Gorgeous, Ruins of Alph, Seafoam Islands, Treasure Beach, Vermillion City, Water Labyrinth
Deep Sea (static), Route 19, 20, Bond Bridge, Cerulean Cave, Cinnabar Island, Deep Sea, Offshore Road, P2 Laboratory, Seafoam Islands, Treasure Beach, Evolve Horsea (Lv32)
Route 32, P2 Laboratory, Evolve Seadra (Lv50 or Dragon Scale)