You can pretty much tell looking at this team that I built this during Dodrio: The Meta™ when everyone was looking to abuse that, as I've included 3 Flying checks + Jellicent to cause Jump Kick recoil + Aftermath and Iron Barbs. That's a lot of prep for Dodrio, sure, but the star of this team is really Jellicent here. The team is built in such a way that its barriers to breaking are handled competently, as I've got Oricorio-E handling Grass-types that are bothersome to Jellicent like Lilligant, Bellossom, Roselia, etc. Togedemaru is excellent in bringing out the Pokemon that Jellicent is made to break too, like Mudsdale, Aggron, Weezing, Sableye, Quagsire, and more. Pokemon like Oricorio-E, Togedemaru, and Skuntank are great to have alongside Jellicent in general, as they offer solid resistances to Jellicent's weaknesses. Defensively, Jellicent does a lot for this team in return, as it checks Alolan Sandslash via its typing, which would be really threatening here otherwise, and its ability supports both Regirock and Claydol. IMO, every team in this meta ought to have Water and Ghost resists for causing 50/50's against other Jellicent, and you see that here with this combination of Jellicent and Skuntank. Claydol keeps Jellicent at high HP by removing entry hazards for it, so that Water Spout's damage output is kept as high as possible.
Claydol is a rather niche pick in this meta, but I think it works well here, especially in tandem with Togedemaru and Skuntank. It functions as a hard stop to this meta's iteration of Hitmonchan, given that most are carrying Thunder Punch now (as super effective coverage for Qwilfish, Jellicent, and Oricorio-Sensu), as well as a nice check to prominent physically offensive threats like Aggron, Lycanroc, Gurdurr, and more. By removing these threats, Claydol's presence here allows Skuntank and Togedemaru to clean effectively late-game. I'm running Claydol a bit differently too, as I'm using invested Shadow Ball as a tech for hitting common Rapid Spin switch-ins, so that Pokemon like Froslass and Jellicent are too pressured to do what they want, i.e. setting up Spikes or wallbreaking, respectively. Claydol's utility as a Volt stop can be handy against Togedemaru when that locks into Zing Zap, slower Lanturn clicking Volt Switch, and the occasional Specs/Scarf Manectric, but that's about it.
Given Jellicent is run offensively, the team can struggle a bit with that standard Hail core of Alolan Sandslash + Aurorus when Jellicent's been worn down sufficiently, so Regirock is running Drain Punch here to help check them. Not only does Drain Punch with the given investment allow Regirock to OHKO Aurorus (
24 Atk Regirock Drain Punch vs. 0 HP / 4 Def Aurorus: 292-344 (75.4 - 88.8%) -- guaranteed OHKO after Stealth Rock), but it also helps when you're forced to stay in when Stoutland uses Superpower or against Steel-types like Aggron. 24 Atk Drain Punch to Stoutland after a Superpower drop recovers roughly 25% HP, while 2 Adamant CB Superpowers (drop in Attack factored in) can only 2HKO Regirock assuming Spikes/Stealth Rock are in play. Regirock is pretty standard otherwise, as it's here to answer potent threats like Dodrio, Stoutland, Skuntank, etc. and weaken its switch-ins with either Toxic or Stealth Rock. It shares awesome type synergy with its teammates here, so I won't go into the basics too much, but it just fits really well and allows Pokemon pressured by Skuntank, Dodrio, Scyther, Stoutland, etc. like Claydol and Jellicent to really shine.
Like Regirock, Skuntank is mostly just glue here, as it keeps Jellicent close to max HP by removing Toxic Spikes, breaks down Togedemaru's defensive answers (ex. Mudsdale, Quagsire, Sableye) via a combination of Taunt and Toxic, and its defensive answers are covered nicely by Oricorio-E, Jellicent, and Claydol. Consequently, it's often poised to clean late-game with its STAB Sucker Punch. It also applies a lot of pressure to Pokemon like Shiftry and Haunter, which are admittedly annoying threats for this team to handle.
Oricorio-E is awesome for luring and breaking Jellicent's, Togedemaru's, and Skuntank's checks. Specifically, its unboosted Hidden Power Ground scores a surprise OHKO on Aggron and Togedemaru (
92 SpA Oricorio-Pom-Pom Hidden Power Ground vs. 0 HP / 0 SpD Aggron: 284-336 (101 - 119.5%) -- guaranteed OHKO), and its Calm Mind-boosted Hidden Power Ground breaks down threats like Lanturn and other slowing Flying resists, allowing Oricorio-E itself to break whatever it needs with Z Hurricane. Luring Togedemaru and Aggron or breaking down stuff like Lanturn is huge in removing offensive pressure from the team by limiting 50/50's against Lanturn, removing Volt stops so that Togedemaru can clean, while really limiting Aggron's ability to break something here. Oricorio-E pulls triple duty in checking Grass-types like Lilligant, Fighting-types like Gurdurr, and is the team's wincon against more defensively-inclined teams.
Togedemaru rounds out the team with some much needed Speed control, and is fast enough for potent threats like Modest Ludicolo in Rain, SS Omastar, +1 Lilligant, Alolan Raichu, Lycanroc (when high HP), etc. U-turn is pivotal (ha) in creating opportunities for Jellicent to break Togedemaru's switch-ins, and so you'll be clicking that a fair bit unless you're fighting something like RH Weezing, in which case you'll just double to Jellicent. Togedemaru is running Reversal here as a tech for other Togedemaru and Aggron, which lessens that defensive burden on Claydol so that it's in a better position to clear entry hazards. But, if you do not run Reversal on Togedemaru, at least run Iron Barbs for things like opposing Togedemaru, Dodrio, Mesprit, and the occasional Scyther.
As far as weaknesses go, strong Dark-types like Alolan Raticate, Absol, and to a lesser extent, Shiftry destroy this sort of comp when you have Skuntank as your Dark resist. Breakers like Exeggutor-A are also strong against this configuration, as you can see in the replay below. Lastly, I think traditional Hail cores pose a threat to this team if you're outplayed, but it won't be an automatic loss by any means given most of your Pokemon here check Modest Aurorus and you've got Jellicent for Alolan Sandslash.
