Galarian Weezing's new Ability, Neutralizing Gas, which is stated to disable all other abilities, it was shown neutralizing a Gastrodon's Storm Drain and a Rotom's Levitate.
A few new Held Items, the "Room Service" which lowers the holder's Speed during Trick Room. The "Eject Pack", automatically switches a Pokemon out when it has a stat lowered, such as after using Overheat or Draco Meteor.
A new move was shown off, "Breaking Swipe", being used by Flygon, which hits both targets in double battles and lowers the Attack.
Corviknight's Hidden Ability, "Mirror Armor", reflects stat-lowering effects, such as from Growl or Intimidate. I personally believe Corviknight will be popular in both singles and doubles formats due to having a Gigantamax form AND such a strong HA.
Dynamax'd Pokemon are shown to be unable to be flinched, such as by Fake Out.
Max moves were revealed to have effects when used, such as raising a stat on your side of the team, or causing a weather condition or terrain condition. Really cool stuff.
They also showed off a new tier system for online ranked battles, as visualized below:
Additionally, you'll also be able to host and participate in competitions with your friends that you get to customize and setup, the depth of which you can do that isn't clear yet but this is the UI for that:
There's so much more information, anything I didn't list here can be viewed on the official Sword & Shield website.
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