Watching Pokemon Smash, which is gonna steam in a minute. I'll update this accordingly.
Edit: The Mewtwo form, it is real.
Edit 2: Pic
It's like Mewtwo only cooler. I'm getting annoyed about the butthurt genwunners, they're acting like I am with Sableye and the whole possible evolution thing. Only with less merit, since this is a new form, not an evolution.
This might be a brand new Pokemon, as opposed to a form. Check out the wording.
Edit 4: Evidence that Newtwo is better then Mewtwo.