For all we know, that wasn't really N at all, it could have just been his Zoroark. I mean, he could have easily sent Zoroark back to Unova to return Zekrom/Reshiram perhaps? I mean, it's been mentioned that the previous player is away looking for N, but N shows up here anyway, and we don't see the previous player at all, although that doesn't have to happen, it still bugs me.. I think it could fit in well here. It would explain the disappearance from N's Castle, and all the hubub about members of Team Plasma like Anthea and Concordia mentioning knowing him from a young age.