RE: OshawottFan and LillipupFTW's Trade Thread
You save then turn you game off. When you reboot scroll down the main menu and click Relocater ( I think it is underneath Mystery Gift ) the you hit start.
After you hit start on you DS/DSi with White or Black you turn on your Other DS/DSi. Once that is on you go to DS download and download Pokemon White or Black. Everything else should be self-explanatory