its called the P2 labritory and its near your home land
somewhere around the poke lab of team plasma
You use the PokeTransfer Lab in route 15. Although you have to beat team plasma after you beat the pokemon legue 1ce.
In the body of water near you hometown. Surf and youll find team plasma's lab 2.
From what i know you have to beat the elite four and and team plasma's N and ghestis in their castle then N will blaber on about becoming a good person bla bla bla then the credits will roll. THEN you will be able to use the poketransfer lab on route 15 to transfer Pokemon from any of the old games apart from the gba's of course you have to migrate them to diamond or pearl then you can transfer them black or white.
You can fight the Shadow Triad east of Icirrus City, on the cliff outcropping past the steps and across the wooden bridge. They can be fought only once per season. If you go all the way to the P2 lab on Route 18, the Plasma Frigate will be there, you can have a rematch against Colress.
yes when you are in the professor's lab
Well plasma can certainly be made in the lab.
Diamond
at the Pokemon transfer lab on route 15.
pearl
pearl
No you can't trade with black to diamond but you can trade from diamond to black using the poketransfer lab. (you will have to have beaten the game before you can use the poketransfer lab). Hope I helped this is luke127 signing off.