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Super autism headcanon time;
>Deoxys' chest is a Keystone
>the meteorites contain Deoxite
>Deoxys, its and all Megastones, and the Anistar crystal came from the same celestial body
>In deep space, it was unprotected from the sun's radiation and light
>hence why the Anistar crystal and Mega stones react during the setting sun when the blue sky no longer obscures the pure sunlight
>the Anistar stone is too big to work on any pokemon, though, since Mega Stones require a pokemon's energy to make it react
>with a small bead-like Mega Stone, its easy to ignite all the energy in it, but a huge one like Anistar would require a ton of pokemon
>even then, Anistar is full of multiple radiations in a big catalyst, no pure radiation to react to single pokemon
>evolution stones are made from the same Mega Stone material but are unrefined and more volatile, with powerful radiation that can only be absorbed once before it becomes a rock
>the powerful radiation can effect multiple pokemon, and causes the "mutation"/evolution to be permanent
>Mega Stones are purer stones with weaker but cleaner radiations that require energy sources and a catalyst stone to ignite the radiation to work
>a trainer's bangle to put energy into the keystone and the individual energy of a pokemon, for instance
>However, the effect is temporary since the radiation is clean and stable, and thus when is no longer powered by an energy source will revert itself and the pokemon to normal
