Released by Game Freak, the Version 1.2 update remains the final and most critical patch for Pokémon Ultra Moon and Pokémon Ultra Sun .
: If the game remains on version 1.0/1.1 despite installation, use FBI to delete the "Update Data" and "Ticket" for Pokémon Ultra Moon before attempting a fresh reinstall.
If you are playing on a modded 3DS or emulator, absolutely seek out the Ultra Moon Update 1.2 CIA . It is the definitive way to play. While the patch notes are boring, the stability it brings—especially if you plan to use cheats, randomizers, or transfer Pokémon to the Switch—is essential for a hassle-free experience.
Note that once updated, any Battle Videos saved on versions 1.0 or 1.1 will no longer be playable. Working with CIA Files (Custom Firmware)