What great news to wake up to and start the day off with :D
Seriously this is a good thing. I just woke up like fifteen minutes ago but fuck I'll share my predictions going forwards too

I very much agree with Comett about these three getting better. MLatios was one of several pokemon with a great match up into GliscPex teams but struggled badly into the HO teams that Moon helped make dominant. With it gone, MLati gets a good bit better. Pecharunt loves Moon leaving as it doesn't worry about giving a Screens boosted Moon set up opportunities potentially (yeah yeah Malignant Chain could potentially help but in my experience rolling that RNG was miserable in that match up). Gholdengo improves purely because it loses a prime offensive check that could use it fleeing as a set up opportunity and thus reinforces its defensive presence efficiency.

All these are breakers that are useful in the GliscPex match up, but hated how much they struggled into Moon HO usually (I guess Wellspring wasn't that bad depending on the match up). With Moon gone, they're easier to use and thus offer a method to pressure these spikes teams.
Keldeo honestly is underrated with SubCM as this can take advantage of the nerfed recovery PP to stall out and beat Pex on such teams while also turning Mola into set up fodder as well. Kyurem is very potent into those same bully structures and also punished annoying Mola builds. UrshifuR was always good, but the hard match up into HO made it a bit harder to use so Moon exiting makes it more consistently helpful. And of course Wellspring was always great and loses a prime offensive check so it gers better.

One niche pick the other quite good, but both also improve with Moon leaving. In my experience Garg is useful into many HO leads and can help with limiting a number of HO threats through Salt Cure but Moon was one threat it struggled to do this with, especially because MoonMoth combos were too much for it. HO should die down so that's all around less important, but still nice and Garg is quite good into slower teams that can't damage it easily and since those teams get better post Moon, I'd wager so does Garg.
Glowking had been picking back up recently but Moon was a really bad match up for it. With it gone, it's much easier to rely on Glowking for uts traditional pivoting and FS duties without worry of letting a huge threat like that in for free.

To be very clear I'm not saying either of these are suddenly worse in a huge way (well I will always take the chance to dunk on Fini lmao) but they were some of very few semi consistent answers into Moon and definitely won't need to be as spammed as they were. Fini I'd say is a decent bit worse off because its overall defensive profile is smaller than Clefable's. Clefable is still great into hazard stack as well as on its own hazard stacking teams so it's not going anywhere in the grand scheme of things.
Whoo that's a lot of yammering but I've said most of what I wanted to. Happy Moon is gone and I'm looking forward to seeing the tier move forward from here. Happy Monday and hope y'all have a good start to the week!