This blog post provides an overview of the Pokémon Ultra Sun v1.2
The "v1.2" update for Pokémon Ultra Sun is usually a boring technical patch, but for a group of data miners in 2018, it became the source of a digital "ghost story" that circulated through Discord servers and forums.
The v1.2 update specifically addressed game-breaking bugs that affected competitive play and move functionality. Move Stability : Fixed a critical glitch where using the moves Forest's Curse Power Trick String Shot could cause the game to freeze during Live Competitions.
The most significant reason to hunt for the v1.2 CIA is the addition of data for post-launch event Pokémon. Without the update, you cannot receive Mystery Gift distributions for:
Corrected a bug where the move Ion Deluge ceased to function properly.