The real max is 255, but as you only get one stat points for every 4 EVs, to go above 252 is a waste. Fortunately, Super Training won't let you do that and will stop at 252. Regular battling can push you over, which is why I love Super Training even more. (And why I don't understand people who insist on still battling a lot.)

No, you're slightly wrong.
EVs were changed in Gen 6 to max out at 252, not the former 255. So if you take the old fashioned way of raising EVs, it will still max at 252 now, not just Super Training.

Oh, and <Insert battle request that will be answered with a "I can't, but I'm gonna be an ass and respond anyway" or "2vs2?">

Okay, i'm on the road to my shiny Furfrou!

Alright i'm two badges in the game and my aerodatcyl will not mega evolve with his stone. Do i need to get alittle further in the game to get him to mega evolve?

You need to be at Shalour Coty and beat the 3rd Gym (I think).

You need to beat the third gym first.

AH HA! Onward to the third gym then. I'm got my team already to rock. Tyrunt, Croconaw, Flaafy, Aerodatcyl, Weepingbell, and Gabite.

I had never actually seen that. That's awesome. And makes things a lot easier! Also makes my argument invalid hehe.

Super Training on member #6 is done. Now he just needs evolved and leveled a bit.

Does anyone want to do a 2VS2?

Yep.