Who said anything about transferring from HGSS to BWB2W2 there's an event in BW for a flying Pikachu that could probably be replicated.
It's this one to be clear. Also here's the link to the whatever it is http://projectpokemon.org/forums/showthread.php?15605-BW-Event-Flying-Pikachu
If there's something i'm missing please tell meh because i'm confused where HGSS came in to the conversation.
Damn it Japan, getting all the events and NA doesn't get anything.