East of New Bark Town is Route 27, which runs West-East. East of Route 27 is Route 26, which runs North-South. You can access these routes when you have eight gym badges and have beaten the Kimono sisters. They lead to Victory Road.
pokewalker route
Route 44.
go to route 44
its on route 26
On Route 35, the route above Goldenrod City.
it comes right after route 27 its past tojo falls and you go on it when you go fight the elite four
Route 30.
route 38
route 44
Route 45
pokewalker route
Between Mahogany Town and Lake of Rage.
You don't!
Route 38
Route 44.
look on serebii.net
go to route 44