Well after become champion you can go back to old place collecter pokedex find new or challenge with new mode like challenge mode hard mode. New route will unlock and you can going in.
You need to defeat the elite four and the champion
The elite four, the champion, (Cheren, Bianca,you have to find them)and,(Cynthia,after you beat the game)
Yes you can battle the elite four and the champion as many times as you want
You can catch it in Reversal Mountain, after having defeated the Elite 4 and Champion.
after defeating the elite four/ champion, you need to go to Nuvema town, and talk to Cedric Juniper.
ok, here's the steps: 1. beat black kyruem (black 2) or white kyruem (white 2) 2. beat ghestis 3. beat pokemon legue (sorry spelled it wrong) 4. beat pokemon league champion iris 5. catch every pokemon (black/white kyruem included) 6. get every item 7. get all wallpapers 8. beat ash (known as red)
You beat the Champion. Then your name and the pokemon you used will be registered.
4 because the sell pokemon white and pokemon black and know they sell pokemon white 2 and pokemon black 2
In Black 2 as well as White 2, Skyarrow Bridge opens up once you've beaten the Elite 4 and the Champion.
Yes
There are 300 Pokemon in the Pokemon Black 2 and White 2 Unova Pokedex.
Route 20 does not exist in Pokemon White, but does in Pokemon White 2.