Where can I get the Super Rod in Diamond? Someone please help.
In Pokémon Diamond and Pearl, along with Platinum, the Super Rod is given to the player by a fisherman in the Fight Area. It can only be obtained once the Sinnoh Pokédex is completed.
Hope I helped!
Source
In the fight area near the harbor where you first arrive go north you see a fisherman talk to him and he gives you the super rod
