Rotom fire and jellicent resist everything. Toxapex and and a flying type like corvikinght work as well since the mon is always choiced, you just run the risk of a sick prediction..What are some great checks to GDarm? both Zen BD and Gorilla Tactics Darm? Pex comes to mind but it can't take eq or zen headbutt. Rotom-Wash could also be an option, but it seems that Darmanitan overwhelms it, Coalossal can take on Darmanitan's STABs, but not its coverage, Milotic maybe? I'd have to calc to make sure it doesn't get 2HKOed, what are some mons that can take on Darmanitan?
Why is this set so potent? Regular Darmanitan-Galar with Gorilla Tactics is incredibly strong as everyone knows. It forces a lot of switches because if it's sent in, it's most often able to outspeed and kill the thing in front of it. Your opponent doesn't know whether you're Gorilla Tactics or Zen Mode, but if they switch, you'll get a free Substitute. This isn't the ony way to get a Sub up but it is the most common. After safely using Belly Drum on the next turn and eating your Salac Berry, you will be at 1676 Attack and 607 Speed.
This is bonkers. It reminds me of sub belly drum kommo-o, except that it has better coverage, speed, and strikes more fear. Definitely viable.