| Location | Method |
|---|---|
| Cerulean Cave | overworld |
| Dark Cave | overworld |
| Dragons Den | overworld |
| Ecruteak City | gift |
| Five Island | overworld |
| Mt. Ember | overworld |
| Mt Mortar | overworld |
| New Bark Town | gift |
| Rocket Hideout | overworld |
| Route 10 | overworld |
| Route 12 | overworld |
| Route 25 | gift |
| Route 25 | hidden |
| Route 34 | overworld |
| Route 35 | overworld |
| Route 39 | hidden |
| Route 45 | overworld |
| Safari Zone | overworld |
| Saffron City | hidden |
| Sevii Waterway | overworld |
| Three Island | overworld |
| Tin Tower | overworld |
| Underwater Kanto | hidden |
| Underwater Sevii | overworld |
| Whirl Islands | overworld |