Where do you get an old rod in Pokemon White?

You can't get an Old Rod in Pokemon White. It's only available in Pokemon Black.

Here are the fishing rods available in Pokemon White:

* Old Rod: Received from a fisherman in the Undella Bay area after obtaining the National Dex.

* Good Rod: Purchased from a shop in Undella Bay after obtaining the National Dex.

* Super Rod: Purchased from a shop in Undella Bay after obtaining the National Dex.

Note: In Pokemon Black, you receive the Old Rod from a fisherman in the Floccesy Ranch area, and the Good Rod and Super Rod can be purchased in the same location.