Well, I've never been through that myself, but I read that if you don't play for a long time IRL, with no time travel and log in, only one villager will have moved out. It's usually the one with highest friendship, it seems. Can't be 1000% sure, though. Maybe we should make a thread to confirm this? >.<
I've never seen/read Hunter x Hunter... all I know is that the mangaka is married to Naoko Takeuchi, the mangaka for Sailor Moon. >v<