You can transfer Pokemon from Gen 2 to Gen 3!

[Sengir]

If only I never restarted my Pokemon Yellow save...

Moving Pikachu, Dodrio, Weepinbell and Dugtrio to Crystal, hooking Crystal to computer, transferring the dudes to Emerald then Platinum (I don't have a GBA flash cart; only NDS) and HeartGold (Pikachu would follow me again!) before maybe sending them off to Unova. That would be so cool ;-;