Not gonna shill the channel where I found this but it's only a matter of time before it's posted everywhere so we might as well get started on this now.
It seems that there's been a new Pokemon found in the trailer, either that or its an existing Pokemon which nobody has been able to successfully identify yet.
No, it isn't Vanilite. That's the one most people thought it was first but that ain't the case and it's been confirmed not to be with pictures directly comparing the two. They're somewhat similar but the differences aren't subtle.

So thoughts? Is this a new Pokemon, and if it isn't then what pokemon is it?