Hey, it's Lord Toxic, that dickhead who keeps running Stall in tournaments. I've been playing ZU for... I think a month at this point (may be five weeks), so I figured I'd throw my hat into the ring with where I agree and disagree with placements.
Agree:
Komala: S -> A+
Yea, I agree with this. It's definitely one of the stronger mons in the tier, but not as centralizing as many other mons (Shiftry and Swanna being the two I've seen suggested). Even as a Stall player, which you'd think would get fucked over most by Comatose, he's easy to wear down and switch into with a decently bulky mon.
Shiftry: A+ -> S
Aaand we have the ACTUAL strongest mon in the tier. This thing is a devastating threat to any and every playstyle, from HO to Balance to Stall, due to powerful stab; priority; a variety of boosting moves; the ability to pivot; powerful utility moves and even more. If you don't prepare for this mon when building, you're getting destroyed. Bear in mind also that Silvally's forms are rising and falling in usage almost solely according to their matchups against Shiftry (Dark, Dragon & Fighting being the best, with Water falling off the map) and you have the definition of a centralizing mon. I'm actually on the point of making a Semistall team with a 5 mon stall core and cleanup w/ Shiftry just to show off the point that it fits onto LITERALLY any team.
Disagree:
Swanna: A+ -> S
Definitely a strong mon, but once you realize what set it's running, it's very easy to counter. The Z Mirror Move set is fucked over by any foul play mon, faster offensive mons, resistances and without Rain Dance, you become painfully exposed to ANY status - be it Burn cutting your attack down, Toxic making you die in a handful of turns or Paralysis making you SO easy to kill in response. The Defog/Roost set works great against stallier teams, but you retain the previous issues of losing to faster offensive mons and dropping to status. Z Rain Dance is easily the strongest of the three main sets, due to the speed boost making you an asspain to revenge kill & the Rain Boosted Water STAB being harder to take a hit from, but Special Sponges still take it on with very little trouble. :/ A powerful mon for sure, but not a centralizing one.
Z Mirror Move:
+2 252 Atk Swanna Brave Bird vs. 252 HP / 208+ Def Rotom-Fan: 105-125 (34.5 - 41.1%) -- 62.7% chance to 3HKO
+2 252 Atk Swanna Brave Bird vs. 252 HP / 252+ Def Unaware Pyukumuku: 90-106 (28.6 - 33.7%) -- 98% chance to 4HKO after Leftovers
+2 252 Atk Swanna Brave Bird vs. 252 HP / 24+ Def Avalugg: 157-186 (39.8 - 47.2%) guaranteed 3HKO after Leftovers
Z Rain:
252 SpA Swanna Hydro Pump vs. 248 HP / 252+ SpD Lickilicky in Rain: 153-181 (36.1 - 42.7%) -- 96.7% chance to 3HKO after Leftovers
252 SpA Swanna Hydro Pump vs. 252 HP / 0 SpD Rotom-Fan: 129-153 (42.4 - 50.3%) -- guaranteed 3HKO after Leftovers recovery
Offensive Defogger:
252 SpA Life Orb Swanna Scald vs. 252 HP / 252+ SpD Eviolite Bronzor: 70-83 (22 - 26.1%) -- 6% chance to 4HKO
252 SpA Life Orb Swanna Hurricane vs. 248 HP / 252+ SpD Lickilicky: 133-157 (31.4 - 37.1%) -- guaranteed 4HKO after Leftovers
My thoughts:
Lickilicky: A- -> A
This is definitely a staple of Stall, due to bring immune to taunt and a straight up sponge, but it's also able to slot into more balanced and offensive teams, preventing set up with the likes of Dragon Tail and net surprise KOs on the physical mons it would struggle with by using Counter. It deserves to be above A- due to being significantly less niche than people seem to have been giving it credit for and due to the downswing of pokemon like Bronzor, who would essentially be able to switch in for free.
Pyukumuku: A- -> A/A+
Block and Z-Spite means this mon is able to essentially remove an enemy mon from the game the second it comes in. Unaware prevents set up being able to screw with you and even after you've run out of Spite PP, you come in and trap statused mons to die. There's very little this pokemon can't do, only truly being weak to powerful SE Stab, like LOrb Abomasnow's Wood Hammer (which I've seen exactly once across the last month or so, despite it being classed as A tier) or Specs Zebstrika. A mon with very few weaknesses, excels at its job, dents any and every team style and that's easily supported doesn't really deserve to have a - in front of it.
Altaria: A -> C+/B-
This pokemon really does VERY little without major caveats. It's a defogger, BUT it's weak to rocks. It's a set up sweeper, BUT its only decent STABs are Dragon Claw and Outrage (and there are better DDance sweepers). It's got decent special defense and Heal Bell, but there are other pokemon that does these jobs so much better, such as Lickilicky and Togetic. The only reason you would bring Alt over another mon is Perish Song, which doesn't work so well in a tier that lacks decent Spikers outside of Crustle (who would be a HO Suicide lead), so it's hard to rack up damage with hazards. This mon is niche as hell and that Niche isn't especially effective.
Stunfisk: C -> B/B+
This pokemon is niche, not gonna lie, but that it does it damn well. It takes Electric, Rock and Flying attacks like nobody's business and doesn't have any problem staying in on a scald or two to Toxic an enemy wall. Its Bulk combined with the ability to set up with Rocks and get off powerful Earth Powers on mons that don't resist it - such as Electivire/Zebstrika/Rapidash/Muk/Silvally/Mareanie, and even a few who DO - such as Pinsir/Komala (assuming no Wood Hammer - scout this with Protect). It shouldn't be considered for EVERY team, but when it fits your team, it will excel for you.
I'd be interested in hearing others' thoughts.
Shiftry’s problem is that it gets worn down easily by itself and its checks. Its hard to switch it in to anything for free besides Bronz, and can be set up fodder for Combusk, Z Encore Chat, Z Mirror Swanna, Z Strength Sap Bell, SD Siv Fight, and more niche mons or sets. It isn’t perfect but it totally is centralizing.
Swanna as an S rank comes with it’s versatility, and I think you are also misjudging the Z Mirror set. Unlike Shiftry, Swanna can manage itself no matter what set it is. If Shift wants to deal with its checks like Siv-Fight or Mawhile, it needs to be a full special attacker for the most part, and that makes it so much more managable. Swanna on the other hand always earns its spot as either a scarf, z move user, or almost anything you can come up with it. It has a phenomenal speed tier and a relatively unresisted dual STAB. Thats what makes it such a great Z move user, because it’s speed can make it likely for it to pull it off, and its STABs could use the extra bp.
Thats the thing with the Z Mirror Move, cause really its more like a Z Brave Bird set. Swanna still functions as a fast mon with a strong BB that can be even stronger with the Z move. Its only going for Z Mirror in late game situations if it needs it. Otherwise it should save it for BB. Mind you BB into Z-BB can do a full 80% to Pyuk, and if your opponent thinks you’re scarf they may never even know its coming.
Quick Ones:
Kom: Yup
Liki: Yup
Pyuk: Nope, because while Spite is a great wincon and its totally a staple, its still shut down by a lot of things: Taunt, Toxic, Electric/Grass stabs, huge PP moves like Haze, ect. And having to run like Rest to not waste PP in the end game and to recover status is coold but again really situational. Works fine as A-, but for now it can just get worn down too easily without packing a punch for the midgame.
Alt: Little too low but I’m for the drop. You should also check out full physdef, its a good mixed Shift check and walls some other things as well. Not to mention the Toxic absorb with Natural Cure. Not a bad mon but has flaws in its typing an 4MS.
Stun: Stunfisk is weak to everything in the meta atm. Grass, Water, Ice, Ground; I mean almost every offensive mon has a STAB or coverage move with this type. And defensive mons can all Toxic it, so no immunity there. Just an annoying mon to deal with but as a Ground type it faces competition with Golem and it’s better phys def and offensive trade offs, and its a still p weak itself and reliant on status heavily. Meanwhile other Electric types can at least pivot with volt. It has its niche, But I wouldn’t say higher than B-.