The update requires approximately 539 blocks (roughly 67MB) of space on your SD card.
The 1.2 update focuses on stabilizing the competitive environment and fixing move-specific glitches that occurred during Z-Move transitions and online play. Key Bug Fixes The update requires approximately 539 blocks (roughly 67MB)
You must update to 1.2 to access online features (Wonder Trade, GTS, and Battle Spot). The update requires approximately 539 blocks (roughly 67MB)
Improved stability for Link Battles and the Battle Spot to prevent random disconnections. The update requires approximately 539 blocks (roughly 67MB)
The update 1.2 for Pokémon Ultra Sun and Ultra Moon was a technical patch designed to fix specific gameplay bugs and move interactions. Pokémon Ultra Sun & Ultra Moon: Version 1.2 Update