Your search is for the Update file. You will need two CIA files:
However, introducing region-free capabilities adds a layer of complexity when dealing with updates: pokemon x update 15 3ds world cia region f portable
Unlike many game updates that introduce flashy new features, Ver. 1.5 was primarily a . The official patch notes are succinct: "Various bugs have been fixed in order to provide a smoother gaming experience". More specifically, the update addressed a notorious issue known as the Lumiose City save glitch , a problem that could render save files completely unusable. The bug occurred when players saved their game in certain outdoor areas of Lumiose City, causing the game to freeze upon reloading. While patch notes did not explicitly name this glitch, the timing of Ver. 1.5's release—approximately 18 months after the games launched—and the documented fix for this issue made it the update's most significant contribution. Your search is for the Update file