Assuming it's a forme (which it very probably is), then I REALLY hope they give him a subtype. Some slight stat redistribution is likely as well, optimizing special attack/speed in favor of attack, hopefully without losing bulk. We already have Deoxys, we don't need another super fast, frail Psychic legend.
Assuming it's not a forme, and God only knows why they would waste a new pokemon slot on Mewthree/Neomew/what-have-you, then I REALLY hope it's got a subtype. I'm REALLY sick of pure Psychic and Dragon/_____ legends.
For either case, make it Psychic/____ with an interesting movepool and I'll be happy. --- Currently playing: MMZCollection, Pokemon Black 2 [2538 3598 3001], FE:Awakening, Xenoblade Chronicles
By "do it" do you mean that said Wizard captured and then physically and maybe even emotionally banged Mewtwo allowing it to break its past limitations so it could reach a new stage of evolution then yes.
I am now uncomfortable in this topic. --- ^( ' ' )^