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Sycamore in XY claims Mega Stones are mutations from other stones, such as Fire Stones.
The Soul Dew is a crystalized form of the soul of a dead Latias/Latios, which powers up either or.
It can easily be construed that Latiosite is a Soul Dew containing the soul of a Latias that has mutated into a Mega Stone, and Latiasite is a Soul Dew containing the soul of a Latios that has mutated into a Mega Stone.
Mega Latias and Latios are, put quite simply, fusions of the living Lati with the soul of the other, which is why red and blue come together for purple on both.
