If you have a US cartridge, you use the USA/World update. If you try to install a region-mismatched update, the game will not recognize it.
Released by Nintendo on February 7, 2018, the 1.2 patch is a lightweight update (roughly 539 blocks ) primarily designed to fix critical game-breaking bugs Move Glitch Fixes: pokemon ultra moon update 12 3ds world cia work
If you are still exploring the Alola region in , keeping your game updated is crucial—especially if you play online or competitively. The Version 1.2 update remains the definitive patch for this 3DS title, resolving game-breaking glitches that previously hindered trainers worldwide. What’s New in Version 1.2? If you have a US cartridge, you use the USA/World update
Pokémon Ultra Moon on the Nintendo 3DS, particularly with Update 12, offers a rich and engaging Pokémon experience. The use of CIA files provides an alternative method for installing the game, but make certain to follow best practices and use trusted resources. With a strong community and various tools available, players can enjoy Pokémon Ultra Moon with enhanced stability and performance. The Version 1
If your game still asks for an update after installing v1.2, it often means the base game CIA has incorrect internal version numbers (a "bad dump"). Reinstalling a clean version of the base game usually fixes this.