A+ -> S-
This mon is peaking right now and it's incredibly good. Both being versatile and one of the most proficient wincons in the tier with IronPress. It's surprisingly flexible with just that set too, and being able to act as an emergency check to so much of the tier makes it highly splashable and reliable. Even when it doesn't sweep it always brings some kind of value to a game and makes it a super consistent choice.
B -> A-
Kind of a big nom but Arch rain is very good with Archaludon being such a potent offensive presence that also compresses valuable defensive utility in one slot. Giving rain a near perfect Wellspring answer that doesn't ease up on the gas is great. It's really only great on rain, as outside of such teams it doesn't do much that Ferrothorn can't do better as a steel type, but it's good enough on rain alone.
B+ -> B/B-
I'll be honest this mon just blows. Ladder uses it so much you'd think this was still pre DLC or even pre HOME when Dnite was still good, but it's just such an inconsistent threat with some annoying moveslot problems. If it runs roost it only gets one coverage which makes it difficult to consistently sweep as you'll get walled by something always, and dropping roost significantly hurts its defensive value.