How can Mewtwo Mega Evolve?


Mewtwo being an artificial pokemon, how can it mega Evolve? Has the mechanics
of Mewtwo mega Evolution been explained in the Genesect movie, game or any
other canon?




It's only theoretical and the evidence may not me be true to the games, but in
the first movie we see Mewtwo create new Pokeballs, that can even capture a
Pokeball, and the pokemon once captured going through DNA engineering device
to be cloned, so it's not too far to say that Mewtwo is the one who created
the Mega Stones for him.

[![enter image description
here](https://i.stack.imgur.com/qr9h0.png)](https://i.stack.imgur.com/qr9h0.png)

Although the theory might not well combined with the game, I can bring
reference to that from the game, once captured in Pokemon X\Y the player is
given automatically the Mewtwonite as shown it was where Mewtwo is found, it
may imply that Mewtwo already had the Mewtwonite.

Though in the remakes for Sapphire and Ruby the player finds the mega stone
for Mewtwo in the Pokemon League buildings, still it's only theory.

(all this support @kaine comment)

[![enter image description
here](https://i.stack.imgur.com/hAF7H.png)](https://i.stack.imgur.com/hAF7H.png)
[![enter image description
here](https://i.stack.imgur.com/24FZC.png)](https://i.stack.imgur.com/24FZC.png)

