So Cress got banned. With that, I'd like to make a few proposals.
Remove Cress, of course, and replace its mention in the explanation with Uxie.
Here are what I'd like to propose:
Uxie up to S-Rank.
With Cress gone, it's back to old times for this thing. Uxie was a meta defining Pokemon before Cress, and now that Cress is gone, he can return to that status. Uxie is THE support Pokemon in the tier, and he can do this well thanks to his immense bulk. He's got Stealth Rock to lay the hazard, as well as T-Wave to cripple opponents, which is very helpful for the team. U-Turn allows him to keep momentum intact, of course. Or Memento to allow a setup sweeper who is typically frail to set up. CM is decent as well, and he can hit decently hard, which also patches up for the fact that he has low attacking stats. Yeah, he's got no competition from Cresselia anymore, and should return to S-Rank, where he belongs.
The other one:
Mesprit up to B-Rank.
Seems odd that I'm saying this, but as the writer of her updated analysis I'm going to give in the point here. Mesprit is one of the most diverse mons in the RU tier-she has 8 different viable sets that all can be run effectively-SR, Band, Specs, Scarf, Offensive CM, SubCM, TR, and Weather Support. Mesprit makes for a great Stealth Rock lead, and with her offensive prowess she stands out from Uxie in this role. While Mesprit may not exactly guarantee that SR will not be spun, she has a fighting chance against some of the spinners, namely Cryo, 'Tops, Shitmonchan (who is common after all), and Shitslash (who is popular for no apparent reason). And her offensive stats also allow for Choice sets, either as a hard hitter or a revenge killer. U-Turn allows her to stand out in CB and Scarf. And Mesprit is also literally the only Psychic-type in the tier besides Gardy who can effectively run Specs. And also, TR could be run effectively thanks to great coverage and Healing Wish, and same with Weather support; Mesprit can take advantage of rain with Thunder or help sun teams with Ice Beam. Yeah, sorry if this is getting very wordy, but Mesprit is easily VERY diverse in what she can do and her niches are enough so that IMO she deserves B-Rank.
We should also add Musharna to the rankings. I don't know where, but Mushy should be on the rankings because it's pretty good in RU. Especially with Cress finally gone.
<TLCNU> Esca literally is 2HKO'd by Stoutland Fire Fang
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