Quoted By:
If your hall of fame team consists of any of the following pokemon you should not own a copy of x/y;
Greninja
Chestnaught
Fennekin
Charizard
Venusaur
Blastoise
Lucario
Blaziken
Any legendary
Honchkrow
Talonflame
Staraptor
Furfrou
Slurpuff
Aromatisse
Barbaracle
Arcanine
Meowstic
Hawlucha
Pidgeot
Pelipper
Fearow
Chatot
Swellow
Malamar
Tyrantrum
Aegislash
Stoutland
Also if your starter is past level 35 you should not own a copy of x/y.