Go to fuschia city and go to the right of the Pokemon center notice 2 houses the first one is the wardens home the second go into and talk to the fisherman then he will give you the good rod if you have room for it.
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there is no ultra rod in Pokemon Yellow. the rods that you may obtain are old rod, good rod and super rod.
Good Rod in Safari Zone
You need to use a super rod
Pokemon you can get with the good rod are: TENTACOOL, MARILL, MAGIKARP, CHINCHOU ( under-water ) and CORPHISH.
Fish with a super rod in Fuchsia City.