Quoted By:
>Megas Stones are made from the life energy of those who fought in the war 3,000 years ago and were used for The Weapon
>Mewtwo has 2 because it and Mew were in Kalos when The Weapon was set off again, but being strong enough they survived, and Mewtwo found a place to rest. Don't know about Mew.
>When the weapon was set off 3,000 years ago a good amount of that energy flew off and destroyed a planet with microbial life on it.
>Said microbial life was trapped in a small meteorite and was flung towards Earth
>When The Weapon was set off again it grazed the meteorite just as it was in the solar system causing it to change it's trajectory and inside Deoxys incubated until the Delta Episode of ORAS
>This could also explain how Deoxys has so many forms. It came to life with the same energies that created the Mega Stones
>This makes Deoxys a pure Mega in flux