Similar to the Battle Tower in 3rd and 4th Gen and the Battle Subway in 5th Gen, X & Y has the Battle Maison; battles in different modes where all Pokemon are automatically set to level 50.
I personally like that they finally introduced Triple and Rotation battles into the Maison; I've found the Super Rotation battles in particular get a bit difficult sometimes since it's harder to predict what the AI will do. I've spent a lot of my free hours in the Maison experimenting with some teams, here's some that I've done:
Singles: Dragonite - Suicune - Scizor (150 wins, unfinished)
Doubles: Blastoise - Volbeat - Tornadus-Therian - Landorus (77 wins)
Triples: Charizard - Terrakion - Latias - Heatran - Camerupt - Talonflame (350 wins)
Rotation: Chansey - Dragonite - Scizor - Ferrothorn (50 wins, unfinished)
And I've only unlocked the Super Multi Battle for the Maison so far; I haven't actually attempted it yet.
So what teams have you guys been using? How far have you gotten in the Maison?
(also if anyone needs any BP items I can trade them pretty cheaply, I have in excess of 5000 BP at the moment)
Wow! I did a doubletake on that BP! I will never see that number on my
game as long as I live! The Maison pretty much eats me for lunch.
I am in need of Choice Specs. What would want for those? I have a few perfect 5 IV pokes if that might interest you.