The Fishing Guru in Olivine City gives it to you.
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super rod route path to cinnnabar
a fisher man in olivine city
well it depends on what Pokemon version you are playing like in soul silver and heart gold you need to use a good rod in new bark town or Cherrygrove city
it depends on which gold you are talking about. in original you talk to a fisherman and he gives you one but might be wrong I am not sure in heart gold but try above i dont have heart gold
On route 12 in the kanto region somebody gives it to you