Well when you get the Natianol pokedex you can miagrate Pokemon from other games just put in a GBA game in the memory card slot and turn on your DS at the menu it should say miagrate Pokemon click on it and vulla but make sure the Pokemon you want to migrate is in the PC or it won't come up.
BUT MAKE SURE YOU WANT THEM TO BE MIAGRATED BECAUSE YOU CAN'T GET THEM BACK.
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You can't! You use your bag. You can't put it in PC like you do in the other Pokemon games.
Nope. You may not migrate pokemon from US games or link them with other region games, in your case UK PAL
Pokemon diamond, Pokemon platinum and Pokemon pearl
Yes you can but you can't trade from black to pearl or white to diamond because the games are not compatible with each other because the Pokemon in black and white will come up as ? in the pokedex's of the other games. But you just can't trade to pearl from black or white sorry. However you can trade between black and white using infrared connection. (the other games don't have infrared that's why the game cancels the trade between pearl and black or diamond to black).
You can get it at Target or Walmart for 20$. It also works for many other games.