Pokémon Ultra Sun is a role-playing game developed by Game Freak and published by Nintendo for the Nintendo 3DS. Released in 2017, Ultra Sun is an upgraded version of Pokémon Sun, which was initially launched in 2016. The game takes place in the tropical Alola region, where players embark on an adventure to catch and train Pokémon, battle other trainers, and uncover the secrets of the region.
The term "3DS World" in ROM hacking circles refers to the region code. pokemon ultra sun update 12 3ds world cia portable