I think the 'shocking revelation' due on Mega Evolutions will be that when it reverts, your Pokemon loses all training. So you'll have to super train it again, forcing you only to use it in dire situations.
Gonna try and start RNGing on W2 today so I can get my Keldeo and Muskadeers done. Which areas don't have NPC's? Need to do my time finder etc and would be useful to know for when RNGing the legendaries.