To install an update file on a physical or digital copy of Pokémon Ultra Moon , your 3DS must be running modern custom firmware (Luma3DS and Boot9Strap). Prerequisites A 3DS system with functional custom firmware. The homebrew application installed on your system.
For users with custom firmware (CFW) or homebrew, the "World" or "Region Free" update is often preferred to ensure compatibility across different base game versions. How To Install CIA Games On A Nintendo 3DS pokemon ultra moon update 12 3ds world cia exclusive