Are you encountering a (like a 002-0119 or 005-4222 error)? How to Update Pokémon X and Pokémon Y | Nintendo Support
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)...
Increased detection for "unauthorized data manipulation" in competitive play to maintain game integrity. Are you encountering a (like a 002-0119 or 005-4222 error)
This patch was required to access any online features, including the Player Search System (PSS), Wonder Trade, and the Global Trade Station (GTS). Key Fixes and Changes including the Player Search System (PSS)
The update primarily focused on "various bug fixes" to improve the overall gaming experience.
Reverted a temporary change, ensuring that Pokémon species names—rather than custom nicknames—were displayed during official online battles.