You walk up and down route 14 and after a couple of minutes, you'll find sage.
route 18
in white forest
route 3
Route 6
You cannot find it in white 2
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
Because Solosis is a version exclusive pokemon, exclusive to Pokemon White. You get Gothita instead.
Surf left from Route 1 near Nuvema Town, go through Route 17 and you will find Route 18.
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.
There is no best route in Pokemon White 2 to find shiny Pokemon, because you have the same chance to find a shiny Pokemon on every route in the game.
You will find it naturally on the upper floors of Celestial Tower (the memorial tower on route 7) on both Pokemon Black and Pokemon White.
In Route 44.
Route 115
You cannot find Vullaby in Pokemon White Version. It is exclusive to Pokemon Black as Rufflet is to Pokemon White.