Cerulean Cave, Route 10, Route 23, Route 25, Seafoam Islands — 5 locations on the interactive map.
Cerulean City, Cherrygrove City, Cianwood City, Olivine City, Route 34, Sea Route 19, Sea Route 40, Union Cave, Whirl Islands — 9 locations on the interactive map.
Krabby → Kingler (Level 28)