On the way to Solaceon town from hearthome city, there is a fisherman. If you talk to the fisherman and say yes, you get a good rod.
You can find it on Route 224, in Victory Road, and at the Battle Frontier.
you can find the webkinz dimond in the muzzle mine mouth
once you find the dimond in the dimond misson part 2 you get it .
somewhere........................................................................................:)
There are many places where someone could find books about fishing. A library would have many good books about fishing. Also, a book store would sell books about fishing.
You can find one at Route 210 (with Dowsing Machine), Route 228, and Iron Island.
Spear Pillar.
you can get diagla on dimond
Anawesome game inwitch you find Dialga! ^_^
you have to get the aurora ticket from a Pokemon event in japan. then you give the ticket to the ferry person and he takes you to Birth island.
Fishing with the Good Rod at Eterna City.
you cant in Pokemon dimond and pearl with out cheating=]