XY wasn't just discovering mega evolution that's what I'm trying to say
Yeah they were. Only four people use mega evolution in X and Y: Korrina, the player character, Lysandre, and Diantha (and possibly Sycamore which would bring it up to five, I can't remember if he uses it or not.) Korrina's family has been involved with it for some time, and seem to be the only authority on the subject, with Sycamore studying under them in an attempt to learn about it. You only get ahold of the technology allowing you to use mega evolution so it can be studied, and I'm assuming Diantha and Lysandre may have obtained it through other means. Why would they even need to study it if much was already known about mega evolution? Also there are several mega stones not present in Kalos; given that worldwide transport of goods is possible where are they? Discounting greed doesn't it seem odd that Pidgeot's mega evolution isn't present anywhere? You can't even import them into X and Y. Why are there fewer mega evolutions available in the future, and why does Rayquaza lose the ability to mega evolve?