You'll find it in the house near the Warden House in Fuschia City.
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Pokemon you can get with the good rod are: TENTACOOL, MARILL, MAGIKARP, CHINCHOU ( under-water ) and CORPHISH.
there is no ultra rod in Pokemon Yellow. the rods that you may obtain are old rod, good rod and super rod.
talk to fishermen. you can get an old rod in the city with LT surge
There is no ultra rod only old rod. good rod, and super rod
In Pokemon Platinum the Good Rod is to the right of Hearthome City. The fisherman on Route 209 will give you the good rod.