Fixed a glitch preventing Vivillon's menu image from appearing correctly in the Friend Safari. Technical Context
: The update data is stored on the 3DS SD card rather than the game cartridge itself. How to Update Pokémon X and Pokémon Y | Nintendo Support Pokemon X: Update 1.5 [Decrypted] 3DS (EUR/USA)...
: Enhanced data-check functions to detect and prevent unauthorized data manipulation in competitive play. If a player encounters someone attempting to manipulate data, they are now automatically disconnected without the match counting toward their rating. Fixed a glitch preventing Vivillon's menu image from
: Disabled the display of Pokémon nicknames during online battles (reverting a temporary change from earlier that month), meaning only the standard species name is now shown to opponents. General Bug Fixes : If a player encounters someone attempting to manipulate
Fixed a bug where Pokémon would occasionally fail to learn new moves after evolving through a Wonder Trade.
: The term "Decrypted" in your query typically refers to a modified game file (ROM) intended for use with emulators like Citra, which cannot run standard encrypted 3DS files.