-> B-
Truthfully I think this one got straight up forgotten in the VR update. Being a 100% fullstop to NDM in all circumstances is a huge niche to have, lays up spikes, an ekiller counter if it isn't Taunt Tera Ghost, can force a trade vs Koraidon clicking flare blitz as it takes 8 million in recoil, and also checks DD Arc-ground nicely aswell. Sure it has thud mus like Ho-oh, Miraidon etc but those are able to be worked around, and the defensive value Skarm brings to the table is outright excellent. Also soft checks Zacian-C, Caly-I (with tera water), and others. This mon is superb. Usually I wouldn't nominate a mon with this higher of a jump from UR, but this is a case where I genuinely think council just forgot Skarmory existed, and not that it's unviable.
-> C/C-
Once again I'm here to nominate Garg into the VR. This pokemon is entirely carried by Salt cure and Purifying Salt, but those are such good tools. Magic guard pokemon don't exist here, and nobody runs covert cloak on anything means Salt cure has free real estate vs the entire tier. Salt Cure is very nice vs things like cm arc-fairy in an emergency, and curse lets you sometimes just run through teams that have alot of physical attackers primarily, like NDM/Korai/Ekiller builds. Here's a replay of me sending Fardin to the deep abyss with Garg in 22 turns:
https://replay.pokemonshowdown.com/smogtours-gen9ubers-739973
-> C/C-
This mon sucks, but it still has some shit. Magic Guard gives it nice longevity, knock off is extremely uncommon, can take up the rocker slot, and Alluring Voice over moonblast can help confuse things trying to setup on it like bulky DD Arc-Ground. It's not a koraidon answer, but Utility Umbrella can let it tank 2 blitz's from scarf korai from full, letting it soft check it to a degree, and can live a +2 blitz from SD Korai and twave it down, shutting it off completely. Not the best claim to fame ever, but it has it's value.
S -> A+
I'll be honest, this thing is overrated. It's most certainly a great pokemon, but alot of teams pack things that drive it nuts. Phys def Ho-oh, Arceus-Water, Skarmory is a good pokemon, and Arceus-Ground can often live a hit and kill it back. Obviously, Tera shakes some of these up, but for some of them, it barely changes the equation. Another issue I have with NDM is knock off. Yes, it has the move. But it practically will never knock anything of value in a game. Between Arc-Forms (sometimes carrying Wisp), Skarmory, and Gira-O/Gliscor, there's alot of times Knock ndm is not knocking any boots, which is part of why I think non dd/otr ndm sets are very crusty. It gets stonewalled and rocks offer minimal value in comparison to spikes and tspikes, especially since alot of the pokemon not running boots are things like Korai and Arc-Ground, who don't care
that much about taking 6%.
This is partially why I think support ndm is kinda underwhelming. Sure, phys def NDM can handle SD Zacians blah blah, but you can honestly just slap dd on a phys def set and still do the job, in which case you aren't a support ndm anymore. This thing just doesn't have the amount of variety in sets it did before. Sure you have Bulky DD, Offensive DD, and OTR, but outside of that I think any other NDM set kinda sucks. Personally I consider it below Arc-Ground and Ekiller in terms of value, especially the former, so that's where I'd put it on the VR.