If you are drafting a guide or a post regarding this specific file, it is important to distinguish between the (which only contains the patch) and a Remastered/Modded CIA (which might include the update pre-installed with cheats or mods). For a standard "v1.2" experience, the standalone update file is the standard.
Pokémon Ultra Sun v1.2 CIA is a decrypted version of the Pokémon Ultra Sun game, which can be played on the Nintendo 3DS console using a CIA (CTR Importable Archive) file. The CIA file format is used for installing games and applications on the Nintendo 3DS console. The v1.2 version of the game refers to the updated version of the game, which includes various bug fixes and improvements. pokemon ultra sun v1.2 cia