The upgrade of the Old Rod which can catch Pokemons such as Goldeen, and Finneon.
How To Get
Gen I: Talk to the Good Rod Guru in a house in Fuchsia City.
Gen II: A house in Olivine City
Gen III (Hoenn): Talk to a fisherman on Route 118
Gen III (Kanto): See Gen I
Gen IV (Sinnoh): Talk to a fisherman on the front bridge in Route 209
Gen IV (Johto): See Gen II