No, but you can transfer/trade Pokemon from Diamond to White.
I'm not that sure if you can trade, but you can transfer.
you go to the trading center with both games and trade them :)
First you have to migrate the Pokemon to diamond(have to beat elite 4) Then you trade the Pokemon to Pokemon white
you can't trade, you have to transfer non-unova Pokemon, and they can never go back to their original game card
You'll need to transfer it from Pokemon Pearl, Diamond, Platinum, Soul Silver, or Heart Gold into Pokemon White with the Transfer Machine in the Transfer Lab in Route 5. You can also trade for it.
You have to wait until you beat Pokemon Black/White and obtain the National Dex before you are able to transfer Pokemon from Diamond and Pearl.
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 only get it by transfering it from Pokemon Pearl, Diamond, Platinum, Soul Silver, or Heart Gold from the Transfer Machine in the Transfer Lab. Or you can trade for it with one of your Pokemon of course.
You can transfer Pokemon but you can't trade Pokemon. Transferring is basically a one-way trade. Once you beat the Elite 4 and Ghetsis in White, you can access the PokeTransfer Lab where you can transfer Pokemon.
You cannot trade between the new games of Pokémon Black and Pokémon White and the previous games of Pokémon Diamond and Pokémon Pearl and there is no way for you to trade Pokémon from "Pokémon Black or Pokémon White" over to Pokémon Diamond or Pokémon Pearl. But you can transfer any Pokemon from the old ds games TO black or white .
you have to transfer from diamond, pearl, or platinum or trade with a friend
Transfer it from Diamond.