Sorry I don't do X and Y but if you are interested in a site that supports X and Y battling and supports the use of all legal Pokemon, go tho http://play.pokemonshowdown.com/ . You won't regret using this site (millions use and play on this site). Just go and click on Team Builder and create yourself a team (no downloads or addons needed), with fully functional items, moves, abilities, base stats and more. If you wonder how to actually battle, go to the top left and switch the format to what "metagame" you want to battle in (such as Over Used, Inverse Battling, Mono-Type, Sky Battles, Middle Cup and more), choose your team you want to use and battle in that metagame. Depending on the metagame, though, different Pokemon, Items andmoves will be banned from that metagame (such as not being able to have the move Double Team or Minimize in any tier except maybe Ubers or Hackmons; Hackmons is where you are able to "hack" your Pokemon you make in a team, giving them "hacked" movesets, items, abilities and EV spreads. Hope this at least helps a little on your quest to play and battle in X and Y gaming (especially the fact that Showdown has an X and Y Wi-Fi room in heir chat that allows people to trade friend codes, battle and trade on cartridge, and just chat).