I did it the first time I booted up White 2. I never even went through Juniper's speech and it worked just fine. So I'm pretty sure yes I dunno about Memory Link, though, I forgot to do that until starting the actual game. If I had to guess the blank slate of the game is already a file in progress, I guess? So it can link with things before then and it will work off of it. But restarting the game just defaults everything or something? I'm no expert on how these games are put together.