There is a glitch in Pokemon X/Y which causes your game to freeze if you save in Lumiose City.
After one day of gaming my game froze and needless to say I was really upset. I really didn't want to delete my save file so I went in search of any possible fixes that others may have found. I'm happy to announce that I've discovered a method based on this post[2] that works.
Step 1: Load your game.
Step 2: As the game loads wait for the music to start.
Step 3: Mash the home button until it works.
Worked for me after about 5 minutes.
Hopefully a patch is made, but for now this is a fix that works.
Good luck to all the trainers out there and hope you can get back to gaming.
Quelle:
Apparently there is a fix for freeze glitch in Lumiose - Pokemon X Message Board for 3DS - GameFAQs