No, but you can import Platinum Pokemon to Black.
Yes
there r 2 regions. sinnoh and the battle frontier
if you are asking if you transfer Pokemon from HG/SS/Platinum/Pearl/Diamond to Pokemon black and white will they be gone from HG/SS/Platinum/Pearl/Diamond then the answer is yes.
no
You can only find a Magma Stone in Pokemon Black 2, White 2, Pokemon Diamond, Pearl, and Platinum. It is not available in Pokemon Black and White.
no you cannot but you can battle latias/latios
Transfer one from a Pokemon Black, White, Black 2, or White 2 game using the Pokemon Bank and Poke Transporter applications.
Of course you can. If you couldn't that would just not be fun. I mean you can trade so u can probly battle 2.
Yes
Yes
In Diamond, you can only get Palkia by trading it from Pearl, Platinum, White, Black, Black 2 and White 2.
Yes, there are many Pokemon games for the DS, including Diamond, Pearl, Platinum, White & Black, White 2 and Black 2, Pokemon Ranger, Pokemon Mystery Dungeon, and more.