My nephew has White 1. Could I use it to activate the Newgame + stuff on my copy of White 2, and then he could still use it for himself when he gets White 2, or can you only do it once per White 1 cartridge? --- The monkey's a girl!
It's not linked to the cartridge, it's linked to the Game Sync ID. So when you go to register your memory link in White 2, as long as you enter in the same ID from White you should get all the lame flashbacks.
[EDIT] Just to add more food for thought: if you started a new game, don't you think they would let you do the Memory Link again? It's not a one time thing. --- I'm not drunk..... I'm just exhausted from drinking so much.