It's Deino, Zwelious, and Hydreigon
No you cannot get a second map.
no but a gray is
You need a second DS and a second pokemon black or white game
No there is not a second region in pokemon black/white but in pokemon black2/white2 the unova region does expand adding places like Virbank city and the PWT (pokemon world tournerment). Hope This Helps :)
don't have the game
Unfortunately not
divide by 0
yes
It's on the second floor of any Pokemon Center.
you train your Pokemon and get a pan pour at the dream yard
You cant without action replay
Definitely Thundurus. You can get 2 Master Balls in Black and White. You should save the second one for shinies or event pokemon.