Released officially by Nintendo in early 2018, version 1.2 was the final major patch for Pokémon Ultra Sun and Ultra Moon. Unlike minor stability fixes, this update addressed core gameplay mechanics, connectivity, and introduced compatibility with the now-defunct Pokémon Global Link (PGL) and Battle Competition features.
If your system prompts you for an update despite having 1.2 installed, the CIA may have been dumped incorrectly with the wrong internal version numbers. pokemon ultra sun update 12 3ds world cia
Pokémon Ultra Sun Update Version: v1.2 (Revision 2) Platform: Nintendo 3DS (Region-Free / World CIA) Title ID (Update): 0004000E001B5F00 Encryption Type: Standard 3DS (Decrypted for install) Released officially by Nintendo in early 2018, version 1
No. The final official patch for Ultra Sun/Ultra Moon is . Any claims of v1.3 or higher are fake or modded ROM hacks. Pokémon Ultra Sun Update Version: v1
Many users download a base ROM labeled "World" to ensure it plays on any region 3DS. If you install a standard "USA" v1.2 update over a "World" base game, the 3DS will see them as two different titles and refuse to launch. Thus, sourcing a World CIA of the update is paramount.
An update (v1.2) patches the game engine. DLC adds new content (e.g., the Mewnium Z or the Team Rocket outfit). You can install both—they do not conflict.
If you downloaded a "Region Free" base game of Ultra Sun, you cannot install a region-specific patch (e.g., a USA-only update). The "World" CIA contains title IDs compatible with all common releases, preventing the dreaded "Update requires a newer version of the game" error.