I refuse to believe that it's a natural phenomenon. If it was, then why would it suddenly have started up nearly two years ago when it had shown no signs of doing so before? And what about those dreams we all have every time we lose a few days? Someone or something cognizant of their actions has to be behind it.

As for a spell...I can't quite buy that either. Everyone in this world is brought down to the world's definition of "normal." The only things with powers here are Pokémon, and even the strongest Ghost-type isn't completely intangible.