You can transfer Pokemon from Gen 2 to Gen 3!

[[robo9]]

Gen 1 and 2 have a few moves that Pokemon can't get in later games, which could prove to be quite interesting.

Well, not really. To get your Pokemon to Gen 6, they have to pass the legality check. Since the transfer deal isn't Nintendo official and is technically hacking, the Gen 1 and 2 moves wouldn't pass the legality check.

But on the bright side, you do get to keep your buddies from RBYGSC from being erased by the hands of time (AKA the save battery running out)