It is to the right of Hearthome City on Route 209.
You talk to the fisherman on the first dock.
Go to the left of pastoria city on route 212 go down , go left,trough the mud,to the house with the woman with the umbrella,go to your left,and talk to one of the fishermen I hope this helped
what he siad
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Canalave City use good rod.
In Pokemon Platinum the Good Rod is to the right of Hearthome City. The fisherman on Route 209 will give you the good rod.
To acquire the Good Rod in Pokémon Diamond, Pearl, and/or Platinum, simply travel to Route 209 and you will meet a fisherman who will give you the Good Rod.
you talk to a fidherman on route 209
you can find it on route 220 using the super rod