A fisherman within the Pokemon Center on Route 32 will give you the Old Rod in Pokémon SoulSilver.
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explore a bridge in kanto
Fishing in Vermillion with a Super Rod.
you do ecruteack city
if its on pokemon soul silver, just use your super rod in violet city.
if ur talking about the old rod then go in the pokemon center on route 32(south of violet city) and talk to someone( i forget who.probably a fisherman dude wearing orange)