You can catch one at Route 6, Route 22, Route 23, Route 25, Four Island, Viridian City, Cape Brink, Cerulean Cave, Icefall Cave, and Ruin Valley. You have to use the Super Rod to fish for one in those areas.
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you can get a poliwhirl or a poliwag and evolve to poliwhirl!! then trade poliwhirl holding a king's rock.
At the town where the gym misty is at. There is a man and hey will give you a jynx for a poliwhirl
in a house in cerulean for a jynx
Super rod use it in viridian city.
Trade the poliwhirl while it holds the item King's Rock then ask for the politoed back from the person you traded it to.