Quote Originally Posted by x.a.x View Post
I'm trying to do something and I want to know when do the Nature and IV get

set in DR.

When you catch the Pokemon or transfer it to Pokemon White 2
Read something in Smogon that the RNG is done when it is being transferred and then automatically saved.

Was in a discussion with Mat on IRC about it. The seed for the Pokemon is generated when you say "yes" after choosing 3DS link. After that he mention that all the Pokemon you caught within Dream Radar so far will be dumped into your box at once.
Seems they didn't like it very much since there's not much room for manipulation.