This is a brief follow up to my last post, and something of a small spoiler for the Pokemon Origins special that's currently running. So those who don't with to have the surprise ruined for them should stop reading now.
It appears that Mega Chairizard X is going to be in Pokemon Origins under the control of Red. I have to admit I feel a little conflicted about this. Pokemon Origins was supposed to be based on the original games, and this Mega Evolution thing is very new. Oh well. I guess all we can do is curse the producers.