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
It is on Route 17, on the western island.
Deep in route 17. You need surf to get there
You get it in an egg on route 17 or 18
Route 20 does not exist in Pokemon White, but does in Pokemon White 2.
route 17 talk to the PKMN ranger in the little house
Surf left from Route 1 near Nuvema Town, go through Route 17 and you will find Route 18.
The Treasure Hunter on route 13 after you beat the game, Route 17 or held by wild Red-Striped Basculin.
You have to surf from route 1, onto route 17 and navigate through the water current maze to get to the lab.
HM Waterfall can be found at the very end of route 17, the route west of Nuvema and Accumula Towns.
Not in a city, it's on route 17, you can visit it after you obtain HM surf.
walk
get a pokemon that knows surf and go to the water at route 1.keep going until your on route 17 and keep surfing around.this works i white too