Well, the only Mega Pokémon's stats I can recall off hand is Mega Mewtwo Y, which is 106/150/70/194/120/140. All Mega Pokémon seem to have a BST 100 higher than the original form.
-I'm currently at the fifth gym right now, and I'm trying to get my Staryu to be on par with the rest of my party.
-It's number four on my favorites list, beaten by Dialga, Gardevoir, and Liepard.
I know they nerfed a lot of special attacks as well, like Fire Blast, Blizzard, Thunder, Hydro Pump, and Hurricane were all nerfed from 120 base power to 110 base power.
Ah, well okay then. I actually have someone else who is gonna trade me a Skrelp sometime later (I just need to find a Clauncher for him). It's unfortunate for me that Purrloin and Liepard are exclusive to Y, but I'm happy they're in the Kalos Pokédex.