Question for Pokemon Aficionados!

[Memefreak]

I know it is possible to trade from Diamond to Black 2 through Poke Transfer. Is it possible to do it the other way around? My friend has Diamond and really wants some of my Pokemon.

 

[Okrag]

"You can't do a normal trade. After beating the Elite 4, you'll have access to a building on route 15 that lets you transfer pokemon from your 4th gen games through a mini-game."
Source: http://www.gamefaqs.com/ds/661226-pokemon-black-version-2/answers?qid=337603