Watching a lot of battles on Showdown. A few observations:
Dynamax Gyarados is very strong. The only things that seem to be able to wall it are Galarian Corsola and Ferrothorn.
Galarian Corsola is extremely bulky, especially with Strength Sap.
A lot of Mimikyu, Ditto, Aegislash, Hydreigon, Excadrill, Gengar. A lot of Screens and Entry Hazard spam.
A few Grassy Seed Hawlucha with Rillaboom
Corviknight is everywhere but it doesn't seem to do much... set up screens and take a hit... but it's so passive.
A surprising amount of Trick Room Reuniclus