Favourite Mega: well my AS team is: swampert, aggron, glaile, lopunny, banette (all with mega stones) and Muk. Those 5 are my top 5 favourite, I just can't pick one LOL
Least Favourite Mega: I don't know, I really like all Megas, but desing-wise, I don't like Mega Sableye and Mega Gyarados...