>>13723812I don't actually know, I've only ever used the AR method as I have a legit copy. That said, if you have a flash cart then I believe you can use Pokegen to extract the legit copy's save, inject the Wonder Card, then write the new save back to the DS card.
http://projectpokemon.org/pokegen/ Check that site. It should have the info you're looking for. Personally, what I'm wondering is, since BW2 Action Replay compatibility is looking unlikely, can we set up our own Wifi distribution with the PGFs so that we get the Wonder Cards instead of using Pokedit like
>>13723516 mentioned?