The most significant component of the 1.2 update was the resolution of a glitch that caused the game to freeze or crash during battles. PocketMonsters.net Move Fixes : It specifically fixed issues with the moves Forest's Curse Power Trick String Shot
Version 1.2 is the required base for major ROM hacks (like Eternal Flower or Supernova Sun ) and translation patches to avoid crashes. pokemon ultra moon 1.2 cia