Version 1.5 followed the 1.4 update (released earlier the same month) and cumulative patches that addressed earlier critical issues like the Lumiose City save glitch. Installation Guide for 3DS Users
The Pokémon X Update 1.5 is a crucial patch that fixes several bugs, including the infamous Lumiose City save corruption glitch and Pokédex image errors Pokemon X- Update 1.5 3DS -World- CIA -Region F...
Corrects an issue where the menu image for Vivillon would not appear in the Friend Safari Animation Fixes: Version 1
This update is required to access the Global Trade Station (GTS), Wonder Trade, and all other Internet-based features. and all other Internet-based features.