I'm not sure if '???' can be a type. Especially when basing it off a Creepypasta (Yes, I am familiar with many Pokemon creepypastas), and if it had to be a type, I'd go with Ghost.
The move in itself seems a bit OP, but it depends on the definition of 'all Pokemon on the battlefield'. If it only affects the opponents and not the user, it is a little much. However, if it affects the user as well, then it becomes a fair gamble, as you are risking your own status.
If the move affects the user as well as opponents, I find the move fit for approval. If it does not, then you're going to have to find a way to tone it down a little.