Update 1.2 for Pokémon Sun on the 3DS is a significant patch released to address critical bugs and is required for all online features like trading and battling.
This update primarily targeted several glitches that could disrupt gameplay or be used for exploits: Pokemon Sun: Update 1.2 3DS (WORLD) CIA
Fixed an issue where Pokémon would become unable to attack or switch if they were knocked out by Spiky Shield damage while using Sky Drop . Update 1
Resolved a rare case where the game would crash if an evolution item was the last item in the bag and was used. If you are using a modified 3DS with
If you are using a modified 3DS with Custom Firmware (CFW) , there are specific considerations for installing the update via CIA:
Corrected an issue where items could sometimes be given to Pokémon Eggs. Installation for Modded Systems (CIA)