I agree with you. There is no way this was Photoshopped by a fan, because whoever did it could only edit it in such a way if they had access to the original file or program it was created with.



If Mewtwo was Photoshopped, it's sort of impossible with the placement of the original design to the new one. They would have had to move every other character out of the way and shift them. And since new Mewtwo's design is smaller and different, you should be able to see editing behind him where the removed areas of the original Mewtwo.



There are too many factors leading towards this not being a fan-made creation.



Although it's still unconfirmed. What do you mean about Genesect's leg though?