The Pokémon Sun and Moon Version 1.1 patch is now available to download from the Nintendo eShop. Nintendo's official English patch notes only list that "Adjustments have been made to make for a more pleasant gaming experience." The Japanese Nintendo support page though lists a few specific changes that this patch includes.

Pokémon Sun and Moon Version 1.1 Patch Notes

• Fixes a problem with the Memento and Parting Shot moves that caused them to not work properly.
• Fixes a issue with Rocky Helmet which caused the wrong player to be declared the winner when the opponent knocks out when the player is also knocked out.
• Fixes a problem which caused certain Pokémon to learn a move when evolving.
• Additionally, it fixed some problems so that players can play the games move comfortably.

Rocky Helmet Item / Memento and Parting Shot Moves Detailed info on bugs from Version 1.0

Rocky Helmet Item: If the holder of Rocky Helmet takes damage, the attacker will also be damaged upon contact. Normally, in a situation where there are only two Pokémon remaining on the battlefield and one of them is knocked out by an attack and the attacker is also knocked out from the damage inflicted by Rocky Helmet, the player with the Pokémon that was holding the Rocky Helmet would lose the battle. For now, the player with the Pokémon holding Rocky Helmet will win the battle.

Memento and Parting Shot Moves: We've discovered a bug that affects the moves Memento and Parting Shot during online battles using Battle Spot. While we fix this bug, Memento and Parting Shot will be prohibited in Free Battles, Rating Battles, and Online Competitions in Battle Spot. If any of the Pokémon in your Battle Team has either of these moves, you won't be able to start a battle.

eShop QR Codes for Version 1.1 Patch Download

Sources: https://www.nintendo.co.jp/support/3ds/soft/bnda/update/index.html, http://en-americas-support.nintendo.com/app/answers/detail/a_id/25400/p/430 and https://3ds.pokemon-gl.com/information/7ebb394e-2b6e-4f3b-95e7-09dfb9888727