I have an odd thought. My theory found within the hide.Mewtwo is a result of horrifying experiments involving gene splicing. It's possible for living creatures to have a body different than what its genes are, via surgery. What if the Mewtwo we know is just a surgically altered body? I would like to point to mega Mewtwo Y for why I thought of this. Out of the mega Mewtwos, Y is more "natural". The mega stat allocation and type are why I think this. Mega Mewtwo Y also looks like a horrific genetic abomination. When a Pokemon mega evolves, you draw out its true power, which in Mewtwo's Y mega's case, brings out a form closer to what its genes are.
To summarize, I theorize mega Mewtwo Y is the true genetic form of Mewtwo, and I think the base form is a surgically altered body. The base form DOES have an extra spinal column, after all.
As for the X mega, I have an entirely different theory about it.
In Gen I it was originally said Mew gave birth and Mew's child was experimented on and became Mewtwo, though since then that story was retcon to Mewtwo being cloned from Mew's DNA.









