>>46151782Based.
Mega Stones were originally explained as a consequence of AZ firing his doomsday machine, and radiating the local landscape. This was a good explanation for why Megas were only being discovered in Kalos, and why they were an uncommon thing for people to have. Even in Pokemon Origins, Red gets both his Mega Stone and Key Stone as gifts from Mr. Fuji, who got them in Kalos. Pretty simple template for giving characters outside of XY access to Mega Evolution without interfering with past games. Basically Kalos is ground zero for the phenomenon, but the stones can be moved around to any other game because they're like held items.
ORAS is confusing because it seems to tell a completely different story. Now Mega Stones can fall from outer space, which means that Kalos wasn't really ground zero after all. And if a Pokemon like Rayquaza can have an "organic" Mega Stone in its body, then AZ's weapon isn't the origin source of the transformation. It's trying to expand on a mystery that was already solved in another game. Which creates more questions and weird inconsistencies between the two. But I guess if we're dealing with alternate timelines, then nothing really matters anyway.