I guess that makes sense. In Sm4sh I find Shulk Palu MU easy as hell for Shulk, but considering I can't pin down anything fundamentally sticking out about the MU - I always consider it even.
Moving on from that tangential analogy and carrying on from my previous post, maybe I could talk about what I see rising back into OU at some point (either via usage creeps or general bans). Think of these as 'mons currently in UU that are underrated in OU' if you will:
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These two are the first I would put on the chopping block - starting with Scizor, mostly for its bulk and excellent defensive typing (with one weakness that can be easily supported for). This thing is also about as flexible as it needs to be, running Roost/Defog support, Uturn for some of the best momentum in UU (and I doubt that changes in OU, given how bulky VoltTurn is supposedly on the rise ft. Magearna), and if your team lacks a good Steel type - good LUCK trying to take boosted Bullet Punches from this thing (and even then it can run Knock Off - which as far as i'm aware, no Steel in the tier appreciates losing its item). I'm aware that this thing isn't as good as its Mega in OU (no s**t, Rentaro) - but I do think it has enough flexibility to rise again whilst leaving the Mega slot open.
Bisharp I think will also rise soon enough (likely through ban tbh), as very little can take a +2 Sucker Punch, even post nerf. Dark/Steel is practically unresisted in UU (as most, if not all of the things that DO resist said combination, are frail), and it also has plenty of flexibility in the tier (Band/LO/SD - hell, I can see Psychium Z being a thing as a Fighting lure, with coverage to boot). Spikes support is also good with Bisharp, as it pressures teams to reach for Defog (one of the things that it punishes the hardest), and overall I think UU is asking a bit too much to keep Sharp there.
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While it has actually proven itself not to be unhealthy for the tier below, the fact that Volcanion dropped at all honestly baffles me (at the end of ORAS OU, this thing was... what, A-?). For one, the standard Specs set has very few switch ins, and with correct coverage - has plenty to counteract its would-be counters (Earth Power to cover it's Rock/Electric weakness and catch Toxapex/Tentacruel slipping, and HP Electric to snipe Pelliper/Gyarados with are the two notable examples I can think of. Alongside excess coverage in the form of Sludge Bomb/Flash Cannon to occasionally beat SpDef fairies with). At times, I've even seen Grassium Z sets akin to the MagDoom Heatran sets in OU to catch other 'counters' like Gastrodon/Swampert trying to come in.
The only reason I can see for this thing dropped off was the burn nerf, but considering this thing can hit so blatantly hard, it doesn't really matter IMO.
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The reason I bring up Raikou is less for its place in UU atm (which I think is for the most part is fine), and more for how it brings to light certain conflicts in our current tiers. Xurkitree, a mon considered slightly mediocre in spite of its “BLOODY HELL!” 173 Sp.Atk, is currently OU - and we have recently had both forms of Thundurus banned from UU (I having a wide movepool, and Therian having a Gigavolt Havoc post-np with essentially no switchins after precious little chip.). I'm not saying Raikou should be banned to the BL - but it does confuse me that Raikou couldn't make use of some sort of CM + Electrium Z set (or similar) to exercise the tier with. To put things in perspective, Raikou is faster than both forms of Thuni' by at least 4 base points, is slightly bulkier (and NOT weak to SR like the other two), and while I do admit it's movepool isn't quite as lavish as the two Thundurus forms, it has as much coverage as it needs to work with. Again, I'm not saying to should be banned from UU or anything - but if there is at any point a form of usage creep, I think that would be a good indicator that this has been realized. Oh yeah, and we have Mega Manetric out of commission atm… that’s worth considering, I guess?
...Or, Xurkitree could drop off and I could be completely wrong.
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If the two steels at the top end up going - I can see this thing becoming unhealthy for UU. Being essentially immune of certain status is honestly a luxury that makes Clefable extremely hard for the majority of teams to deal with, as well as immunity to LO recoil and being able to switch in and out of SR feely. Speaking of which, being able to lay Stealth Rocks itself, as well as having the typing to scare Mega Absol (IMO the tiers’ best Magic Bouncer) is a trait in itself – and if you’re not one to logic check team layouts, Clefs’ wide move pool makes it one of the more unpredictable mons in not just the tier, but the game in general. Don’t even get me started on how bulky this thing is, either…
Tl;dr – think ORAS Clefable, but with the Twave nerf blown out of proportion.