I assume that Mewtwo became jaded at discovering that his only reason for existence was because Team Rocket wanted a "Tool", of course he cloned other Pokemon, but they started off relatively fresh without the complication of figuring out their own existence.
Though Genesect is a weird case, mostly because it's an augmented fossil Pokemon in which that there are about...5 or so, they seemed to move in a hive-like unit which strikes up the question of if they're even sapient or not, or if Machinery has taken their Souls...
RSN: Plucky9, Total: 2356 KoL: Plucky, currently a Avatar of Jarlsberg
See, I think the Genesect in formation is a combination of: 1) They're insects, so they could have a queen (possibly the infamous Shiny Genesect) 2) They're mechanical, so they can communicate instantly.
I think that it won't be a signature move, because, you know, Psystrike, but a forme seems unlikely for Mewtwo. I bet it will just be a Mewtwo with... I don't know, Judgement? Psycho Boost? Some existing move.
For those of you starting topics about the PS4, there's a PS4 board: http://www.gamefaqs.com/boards/691087-playstation-4