You can catch a Chinchou with a Good Rod if you fish in Routes 26 and 27, Olivine City, Vermilion City, Pallet Town, New Bark Town or Union Cave (the bottommost floor).
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catch a chinchou with a good rod you get in olovine city and evolve it at level 27
super rod route path to cinnnabar
Pokemon you can get with the good rod are: TENTACOOL, MARILL, MAGIKARP, CHINCHOU ( under-water ) and CORPHISH.
You can capture a Chinchou in Route 210 with the Super Fishing Rod. It is quite common, for it appears with a 30% chance.
You can use a super rod and fish to catch chinchou in any of the following locations: Route 20, Route 21, Route 26, Route 27, Route 41, Route 47, New Bark Town, Pallet Town, Vermillion City, and Cinnabar Island.