West of Route 1, requires Surf.
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Close to home. Use Surf at route 1, go to the island and head west. You'll find route 17 and 18 past the gate.
You find the dubious disc at the p2 laboratory on route 17-18. You find the upgrade on route 15, very close to white forest. You have to beat a Pokemon ranger and have strength to push a boulder and get to it.
route 3
You can find grimer on route 17 in Pokemon heartgold.route 16,route 17,route18,Celadon city and the safari zone.Good luck! :)
Route 18