The update data for Pokémon X is different from Pokémon Y ; you must ensure the update matches your specific game version and region (EUR or USA).
The update primarily focused on "various bug fixes" to improve the overall gaming experience. Pokemon Y: Update 1.5 [Decrypted] 3DS (EUR/USA)...
Increased detection for "unauthorized data manipulation" in competitive play to maintain game integrity. The update data for Pokémon X is different
Like previous versions (1.1–1.4), version 1.5 includes cumulative fixes for older issues, such as the Lumiose City save glitch and GTS communication errors. Installation for Decrypted/Emulated Systems Pokemon Y: Update 1.5 [Decrypted] 3DS (EUR/USA)...