I believe Mega Aggron and Mega Tyranitar were peudo-confirmed because their balloons showed up in super training.
Really any pics?
Mega Tyranitar http://i.imgur.com/lSzP8k2.jpg
Mega Aggron http://i.imgur.com/jGHpqv9.jpg
Both from a guy on these boards who got the game early. He provided evidence of having the game with confirmation that the images were actually his. --- http://www.youtube.com/watch?v=2WZsZReahfg Mewtwo has got his throne back! BST 780! Take that Arceus!