How do you get the old rod in Pokemon Crystal?

All this battling is plenty fun (and profitable), but what you’re really looking for is the entrance to Union Cave. It is all the way to the south, past a handy Pokemon Center. Go in there and talk to the fisherman on the left. He’ll give you an Old Rod which you can use by the water to fish for Pokemon.

THIS IS FUN:  Question: Is fish head curry from Singapore?