Nintendo and Game Freak released the v1.2 patch to specifically target glitches that disrupted competitive play and caused the game to crash. The main fixes include:
For the uninitiated: A file is the installation format for 3DS software on custom firmware. Unlike a .3DS file (used for flashcards or Citra emulator), a .CIA installs the update directly to your console’s SD card, merging it with the base game. Pokemon Ultra Moon- Update 1.2 3DS -WORLD- CIA ...
The 1.2 update for Pokémon Ultra Moon fixes game-crushing bugs, patches competitive exploits, and is required for online play. Nintendo and Game Freak released the v1
For the average player, this update would download automatically via the 3DS eShop, requiring about 539 blocks of free space (approx. 68 MB). However, the widespread use of the .cia file is within the CFW and homebrew scene. However, the widespread use of the
