During the opening of the Pokémon World Championships, the President of Pokémon and Junichi Masuda revealed new information about Pokémon Sword and Shield. They are as follows:

• Galarian Weezing gains the Ability Neutralizing Gas. It prevents any other Ability, e.g. Levitate or Storm Drain, from taking effect while it is in play.
• A new Held Item Room Service lowers a Pokémon’s speed during Trick Room.
• A new Held Item Room Service switches out the Pokémon if its stats are lowered – includng by attacks made by itself.
• A new attack Breaking Swipe lowers the Attack of all Pokémon hit.
• Corviknight’s Hidden Ability is Mirror Armor, which reflects any stat-lowering effects.

We’ll bring more information shortly.

Source: Daily.pokecommunity