Patches for Pokémon X and Y and Pokémon Omega Ruby and Alpha Sapphire are now available to download off via the Nintendo eShop. The version 1.5 patch for X and Y as well as the version 1.4 patch for Omega Ruby and Alpha Sapphire both officially state that: "Various bugs have been fixed to provide a smoother gaming experience." (ゲームを快適に遊んでいただけるよう、いくつかの問題を修正しました。) The patch is required to play in all official tournaments as well as any online play.

XY Version 1.5 QR Update Codes

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ORAS Version 1.4 QR Update Codes

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Sources: http://www.nintendo.co.jp/3ds/ecrj/update/index.html and http://www.nintendo.co.jp/3ds/ekjj/update/index.html