Before we get into the technical weeds of decryption, let's clarify the software itself. When Pokémon X and Y launched, they were relatively polished, but Game Freak quickly rolled out patches to fix game-breaking bugs and balance online features. The final patch for the game is officially (sometimes referred to in file systems as "Update v1024").
Released in April 2015, this update addressed several technical oversights that affected the original 2013 release.
: Emulators cannot read the proprietary Nintendo encryption keys naturally. Therefore, a "decrypted" update is one where the encryption has been stripped away so it can be loaded directly by Citra or other PC-based tools.
Document and analyze Update 15 for Pokémon X (3DS) — its contents, technical structure, region differences (EUR vs USA), decryption/ROM/firmware considerations on 3DS, installation/patching methods, and examples of file inspection and verification. Intended for researchers familiar with console modding and ROM hacking. Do not use this as encouragement to perform copyright infringement; this is a technical study.
To get your game updated on an emulator, follow these steps:
Re-disabled the display of Pokémon nicknames during online battles, reverting to showing the official species name instead . Installation Information