Big Slate. Time to review.

Sub feels very uninteresting to me. I have always been distasteful of subs make or the express purpose of validating a singular playstype instead of adding a worthwhile Pokémon and I think this is that. This is only a buff for stall, a very specific variant of stall in fact. As for the Pokémon itself? It is an objective buff for sure, not sure how well this will serve it long term though, as even with Parting Shot Shedinja simply will not become a stall staple Pokémon, and this is highlighted further with the absense of a Magic Bounce user, which I feel is necessary to any great Shed stall team. So yeah Shedinja + Umbreon are essentially a dual ultra pack, and that just rubs me very wrong. I don't intend on wasting a vote slot on giving a small buff to a sub variant of a an already niche playstyle, that demands you must vote for something else anyways.

I feel exactly the opposite about this thing. This Pokémon is cool! Fire type Regenerator Pokémon have always been an interesting avenue to explore, and while imo Turt lacks certain tools that would imo rank it as great Pokémon, it has JUST enough to give it a niche on Balance and Bulky Offense as a sort of check to certain strong Pokémon while maintaining a form of offensive presense. Lack of reliable recovery and great status moves really hurt the usefulness of a Heavy Duty Boots set, which sucks because this Pokémon REALLY wants HDB. No Knock Off, U-turn or a Future Sight esq clone also makes Assault Vest sets a bit strapped for utility options to run. I feel this is what truly holds it back from being one of the best options available, both from a teambuilder standpoint and on this very slate, but it is still a strong contender to get in.

Similiar to the Dragon above, with more or less the same favtors at play here. Poison Heal is big for Goodra, allowing it to be a status and Knock Off sponge is very cool, and definitely improves its defensive profile. Its major issue here is that, similar to Turt, it HEAVILY relies on the utility that just its stats and ability provide, with its utility / defensive movepool bejng limited to just Dragon Tail. I am thus a bit unsure on HOW I'd build with Goodra, and more specifically why I'd add it to my team - it doesn't spread any status sans Toxic, the most benign of options, it cannot set nor remove hazards, and while decent, its defensive typing is not the most thrilling thing in the world, essentially just boiling down to some elemental resists. Goodra's best bet imo is to hunker down on a more offensively leaning set that just how happens to be hard to wear down, or try it's hand at Curse sets, these would be a quite the hassle to punish once it has a few boosts under it's belt. All in all, i think its a bit worse than Turt, something like a B-/ low B tier Pokémon.

If we are looking at this objectively, it is the best Pokémon slated. 90/150/150 bulk with Reflect goes BANANAS and allows it to fit on all manner of builds from hard Stall to Balance relatively easy, and would cement itself as a top Steel even while lacking recovery. It is not a sub that particularly grabs me however, largely for the same reasons Ema stated. I generally like somewhat more dynamic Pokemon, and if they are not dynamic I want them to trupy be THE blanket Pokémon (Blissey). I will not, however, deny just how good of a Pokémon this Registeel would be (again FAR and away the best sub here).

Jokes, lastly we have here Umbreon. I think this is actually a really good submission [for stall]. Umbreon packs the coveted Magic Bounce ability, which is highly useful to repel not only hazards and status, but also more niche applications like Leech Seed, Taunt and Encore, all of which are a pain for [stall] teams to handle. It can sustain itself with Wish, and can double as a means to help it's [stall] teammates sustain themselves throughout the course of the match. Parting Shot is definitely a cool bonus as well, but imo would largely prefer Toxic [on stall squads] to give it a lesser chance of being set up bait. All in all, Umbreon is a pretty stellar submission [for stall teams].
If you noticed, I had the pretext of stall on most if the talkjng points I brought up here, and that is due to Umbreon here largely being deadweight anywhere else. Umbreon can bounce back Stealth Rock sure, but does next to nothing back in return. Having Foul Play as your only means of damage output is easily exploitable, and WishTect as your only means of recovery is double so. This Pokémon would live and die by the move Parting Shot here, while good, can be aomething that will be rather predictable and can be exploited by a careful and intelligent player. Also, Dark is not really a good defensive typing at all, outside of checking specfically Ghost types it operates as a much more inferior version of Steel. There is a reason people stacked Steels and not run double Darks during the height of the Psychic type reign in Gen 7. In conclusion, if you fucks with Stall, this is one if your go to subs this slate. If not, not sure what you are voting for.
In summary, these subs are all interestjng to varying degrees, and perhaps maybe outside of Shedinja or MAYBE Goodra, I do not think there are any wrong answers here. Whatever you pick is pretty much just determined on what playstyles you like to pursue in the metagame. I personally will probably vote for

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For the Zarudes? I'll keep if brief <spoilers, I DID NOT>. Flower Veil is an ok buff, but feels a lot more underwhelming when people realise Zarude's sole niche in OU before it became TC Choice Locker, was that of a Stallbreaker uncrippled by Status. Flower Veil does take that one step further and makes it so you never get statused, but I think Zarude never truly struggled in that department due to how intelligently the Pokemon was designed. The Intimidate immunity is great though. Technician is rather interesting, as it seeks to buff Zarude's damahe output in a more consise and reserved way with Technician, making Bullet Seed a hell of a move to switch ibto, and making Bite's flinch shenanigans a comical sight to behold. Not sure what else Zarude gets that benefits the ability though, if it got Beat Up that would legit be amazing. Intimidate is pretty cool, makes specifically its Scarf and Boots set ftom lower tiers much more interesting to play against and utilize, but leaving Bulk Up sets in the dust, as Intim doesn't really help it set up versus the targets it wants. Still imo, my second favorite sub here. Moxie just makes BU Zarude a snowballer, which is perfectly fine, as it strengthens its current niche in OU, but not enough to be worthwhile imo (I'd think even with Moxie Scarf Zarude doesn't go off unless the opposimg team is HEAVILY weakened). Of course I am biased since I made this contribution, but I truly think Swords Dance is the best way to go about bolstering Zarude's success. Zarude's major problem was damage output, leaving Zarude unable to threaten most playstyles outside of fat with Bulk Up specifically because Choice sets were too easy to punish to be worth locking into, and Bulk Up did put enough immediate breaking pressure on more offensive teams. Swords Dance attempts to alleviate that issue, as a +2 Zarude is a much more immediate and threatening Pokémon for Balance and Offense alike, and not spending two turns to get to that level is a gamechanger, without pushing Zarude's immediate power through the roof into dumb levels Tough Claws did. Of course you will need to find set up opportunities, but I think one would be surprised (or not if you have been plsying OU Theorymon) at Zarude's natural bulk giving it ample mwans to exploit your defensive core without probably massacring your entire Offensive team ala Weavile. That is a great way to look at Swords Dance Zarude actually - balanced Weavile. In conclusion, I am shocked no one did the +15 Atk or even Knock Off, those would have been huge too. You know what I am voting for here, so I will just rank how good I think the Zarude buffs are - SD followed very closely by Intimidate, a sizable gap, then Moxie=Flower Veil, then Technician*, which is wildly subject to change purely based on what moves outside of Bullet Seed and Bite does Zarude have cooking.