Update 1.5 is the final official patch for Pokémon X and Y, released in April 2015. For emulators like or modded 3DS systems, you typically use a decrypted .cia or .3ds file. For Citra (PC/Android):
Fixed a specific issue that caused disconnects during Random Matchups and Online Competitions. Pokemon X- Update 1.5 -Decrypted- 3DS -EUR USA-...
Re-disabled the display of Pokémon nicknames during online battles, reverting them to their species names. Previous Major Fixes Included Update 1
Here is the report on the status of Pokémon X updates and the meaning of "Decrypted." Re-disabled the display of Pokémon nicknames during online
Verify the version by checking the bottom-right corner of the game's title screen. 2. Gameplay & "Decrypted" Context
It is important to clarify from the outset that The official version history for the 3DS titles ends with Version 1.5 of the system software (for the Nintendo 3DS itself, not the game) and Patch 1.5 for Pokémon Sun & Moon —which is a frequent source of confusion.
This patch was historically required to access official tournaments and online play via the Nintendo Network Nintendo Support Changelog & Fixes The official notes from Nintendo and