Alright from the matches I've done on my main, and my alt account for college, Marshadow Mansion, I'm gonna make a rough viability rankings! This isn't a final one or anything, obviously we need to work together for that one! (also excuse the lack of minisprites, got too much to do to worry about that atm lol).
Also outside of the ranks, I'm not really putting these Pokemon in any particular order. I'm probably forgetting some obvious mons too since I made this in a bit of a rush! Because of the rush, some Pokemon don't have descriptions at the moment, I can justify them later if you guys want when I got more spare time!
S Rank
Marshadow: I think this one is pretty obvious. Sash Marshadow alone screws up most of the sweepers in this format, and its a good reason to look deep into the meager pool of Stealth Rock setters (or run Toxapex). I don't feel its quite as dominant as it was in Ultra No Holds Barred just because outside of the species and items clauses, theres much more Toxapex in this format than before! Also, due to Volcarona being such a threatening sweeper, I feel that Rock Tomb is a better option than it has been in the past. Also, Bulk Up Marshadium Z sets are nice for luring Toxapex!
Mimikyu: The other super strong spooky Ghost-type! With most Steel-types being nuked from this format, Mimikyu is absoloutly terrifying. The lack of good mold breakers (seriously you got like... Basculin lol) makes bulky Mimikyu quite difficult to handle for offensive Pokemon. For example, you only need 120 HP EVs to survive Marshadow's Shadow Sneak without Stealth Rock! In addition to being the usual sweeper stopper, Mimikyu is also the premier setter of Trick Room, great for letting slower stuff sweep.
A Rank
Volcarona: This thing is a TERRIFYING sweeper, pretty much every defensive check to Volcarona got banned. Not even Toxapex works, because Psychic is on most Volcarona at the moment, and its totally screwed against Psychium Z variants! It can run straight up offensive sets of course, but bulkier sets that can mess with Mimikyu are absoloutly viable as well. The only reason why I didn't put this in S is because of the 4x Stealth Rock weakness, but honestly I'm open to moving it up just because its so hard to check otherwise!
Darkrai: FINALLY, gamefreak made a format where Darkai is good! I've had a bit of trouble fitting this in, but it's pretty versatile for a special sweeper in this format. Darkrai has damn near perfect coverage, Nasty Plot, and if you want to roll the dice, it's very capable of using Z-Hypnosis for Xurkitree styled sweeps! That being said, outside of sleep shenigans, it is weak to Mimikyu, and has issues with Marshadow speed ties and random Scarfers. Still a damn fine mon regardless!
Xurkitree: Oh yeah speaking of Xurkitree, this thing is much more threatening than usual, mainly because this format doesn't have many good Electric-type switch ins. It works pretty much the same as usual, though some of us have speculated about Z-Electric Terrain and Z-Rain Dance Xurkitrees as alternatives to the usual Scarf and Z-Hypnosis shenigans. This thing is still pretty frail though, so don't get too reckless!
Naganadel: Like Xurkitree, a lot of Naganadel's usual checks bit the dust, so stopping this thing directly can be pretty difficult. Like most sweepers, its pretty Mimikyu weak, but after a Speed boost, you pretty much have to rely on Marshadow having an intact Focus Sash to stop a healthy Naganadel!
Toxapex: You'd think that a format that nukes most stall Pokemon would be bad news for Toxapex, but it actually did the opposite! Toxapex is the best check to Mimikyu and Marshadow you can ask for (granted, both of them DO have ways around Toxapex). With most Ground-types being gone and there being a lack of good Psychic-types, Toxapex's only big flaw is its Electric-type weakness. Otherwise, its the premier defensive mon of the format.
Gliscor: My arch nemesis is still excellent in this format with its usual Poison Heal stalling shenigans! However, abusing poison and OHKO moves isn't the only thing Gliscor can do. It also seems to be one of the most reliable setters of Stealth Rock in the format if you're willing to give up some stalling or OHKO power.
Nihilego: Nihilego is a pretty good offensive Stealth Rocker. Beleive it or not, despite its poor defense stat, you can actually survive a Marshadow Close Combat with just 84 Def EVs, so you can do weird stuff that I did like run Red Card + Stealth Rock to screw over Sash Marshadows! However, note that investing 84 Def EVs means you either get a Speed Boost from Beast Boost, or have to lose speed ties with Nihilego to get the SpA boost... Anyways, Nihilego also stands out as a damn good Choice Scarf Pokemon, being an excellent revenge killer of Volcarona!
Rotom-W: Rotom-W is one of the best pviots you could ask for in this format, making excellent use of Choices Specs and Choice Scarf because of it. They can even run Trick to mess up Tangrowth switch-ins! Bulky sets with Will-O-Wisp are also viable to discourage Mimikyu and Marshadow from attempting a revenge kill.
Aegislash: Thanks to the bulk Shield forme provides and King's Shield itself giving Marshadow and Mimikyu a hard time, Aegislash is still a fantastic offensive threat in this metagame.
Hydreigon: You'd think Darkrai would outclass this thing, but Hydreigon has one very important thing over it: U-turn! Thanks to U-turn, you can break Mimikyu disguises instead of letting it set up for free. If you use Choice Scarf, you can even punish Marshadow in a similar way, and also get the jump on slower, bulkier Volcarona if you go mixed with Head Smash (watch out for the accuracy). Even for non Scarfed variants, Hydreigon's access to U-turn is just too sweet to ignore imo!
Araquanid: Araquanid stands out from Rotom-W by having much better Water-type offenses due to Water Bubble, and the Bug-typing giving it a handy Fighting-type resistance against Marshadow. It works pretty damn well on Trick Room teams, but it can also set up Sticky Webs so you can outspeed speedy threats with other teammates! This one was orginally going to be high-B, but I put it in A just because Sticky Webs pushed it past that for me.
B
Tangrowth: While not as prominent of a defensive Pokemon as Toxapex, Tangrowth happens to work pretty well with it. Tangrowth is another regenrator mon like Toxapex, but it does a lot better against Rotom-W, and is also probably the best user of Leech Seed in the format. Just be warned though, its Special Defense stat sorta sucks.
Rotom-H: While the Fire-typing may not make quite as much sense as it does in other formats, Rotom-H is still pretty competent for similar reasons Rotom-W is. As a bonus, it handles Tangrowth and Aegislash much better. Honestly I'm tempted to move this thing up to A, but I want some feedback on that first!
Krookodile: This is possibly the only viable offensive Ground-type allowed here. Certainly not as good as the usual suspects for Ground-types in most formats, but Krookodile can get the job done thanks to Intimidate. Its a pretty decent setter of Stealth Rock, and can also use a Choice Scarf set to surprise Marshadow. Access to STAB Knock Off is nice too!
Gigalith: Gigalith is another viable setter of Stealth Rock, being able to use Sand Stream to boost up its SpD, or Sturdy to have more of a gurantee of set up. Gigalith also stands among the few viable users of Gravity, which can be extremely dangerous if paired with Z-Hypnosis Xurkitree or Darkrai! Also notable, if you use an Adamant specially defensive spread of 252 HP / 4 Atk / 4 Def / 244 SpD / 4 Spe with an Assault Vest, Gigalith becomes one of the best checks to Naganadel and Volcarona in the format!
Ditto: With all the fear of Marshadow turning the tables on sweepers, you can give them a taste of their own medicine with Ditto! However, note that Ditto preforms pretty poorly against bulky Pokemon itself.
Slurpuff: Slurpuff is a more dedicated Sticky Webs Pokemon than Araquanid. You can use Sweet Veil so Xurkitree and Darkrai can't put it to sleep, or you can use Unburden with a berry to activate unburden, and screw Marshadow over harder provided you invested in enough EVs to survive 2 Spectral Thieves (very possible, but the EVs will vary depending on what else you want to survive). It also gets access to Yawn, which, while not as effective without Stealth Rock set up like Hippowdon can in other formats, can still be annoying. There is also that Belly Drum set too, but I've only seen that once, not sure if that's worth it, especially with Marshadow around.
Galvantula: The other webs setter. It doesn't stick around nearly as long as Slurpuff does, but in exchange, its fast and gets access to Thunder Wave, which comes in handy if you need to screw over fast threats like Marshadow as a lead! Compound Eyes also does wonder for it offensively, letting it get away with a more accurate Thunder than usual to hit things hard. You can even choose to pivot with Volt Switch, or you can just hit annoying Electric-types with Bug Buzz!
Aerodactyl: This is among the few Stealth Rock setters to actually outspeed Marshadow and Darkrai, which is pretty neat. Outside of Stealth Rock setting, it also seems to make a competent offensive Pokemon for its speed and decent coverage alone, though its STABs aren't great, having to rely on the shaky Stone Edge. It also gets a cool ability in Unerve, which can mess up some Pokemon that rely on berries to survive stuff normally!
Crobat: I found this to be a nice alternative to Aerodactyl. It's offensive stats aren't as good, but it does get a powerful STAB in Brave Bird, and gets the lovely U-turn to punish Mimikyu and annoying sash things like Marshadow! However, Crobat's coverage as a Choice Bander isnt as good as Aerodactyls, and the recoil means Crobat usually doesn't last that long either. I should also note that Inflitrator is a rad ability for messing with Sub users!
Chandelure: Chandelure is a bit overshadowed by the other Ghost-types, but with Inflitrator, it does fantasticaly well against Substitute Gliscor (well for revenge killing at least), and it has great coverage for a Fire-type as well. You can even use a sash set with Trick Room.
Omastar
Bewear
Alolan Muk
Golisopod (might be C, not sure yet)
Crawdaunt
C
Mawile: Mawile without mega evolving sorta sucks on paper, but it also happens to be one of the few Steel-types in this format that can set up Stealth Rock. If you use Impish and max defensive and HP investment, it can actually set up Stealth Rock pretty well against Mimikyu and Marshadow, and also has Rock Tomb to mess with Volcarona switch ins. It's offenses are pretty pittable when you do this though, and unforutnately, unless you use your viable Focus Sash on Mawile, it can't survive what it needs to without the massive defensive investment. Still, this thing worked a lot better than I expected tbh!
Weavile
Malamar (almost tempted to put this in B but I saw few people using it, + I havent tried it myself)
Scolipede
Eevee
Bisharp
Blacephalon
Gengar
Granbull
Also outside of the ranks, I'm not really putting these Pokemon in any particular order. I'm probably forgetting some obvious mons too since I made this in a bit of a rush! Because of the rush, some Pokemon don't have descriptions at the moment, I can justify them later if you guys want when I got more spare time!
S Rank
Marshadow: I think this one is pretty obvious. Sash Marshadow alone screws up most of the sweepers in this format, and its a good reason to look deep into the meager pool of Stealth Rock setters (or run Toxapex). I don't feel its quite as dominant as it was in Ultra No Holds Barred just because outside of the species and items clauses, theres much more Toxapex in this format than before! Also, due to Volcarona being such a threatening sweeper, I feel that Rock Tomb is a better option than it has been in the past. Also, Bulk Up Marshadium Z sets are nice for luring Toxapex!
Mimikyu: The other super strong spooky Ghost-type! With most Steel-types being nuked from this format, Mimikyu is absoloutly terrifying. The lack of good mold breakers (seriously you got like... Basculin lol) makes bulky Mimikyu quite difficult to handle for offensive Pokemon. For example, you only need 120 HP EVs to survive Marshadow's Shadow Sneak without Stealth Rock! In addition to being the usual sweeper stopper, Mimikyu is also the premier setter of Trick Room, great for letting slower stuff sweep.
A Rank
Volcarona: This thing is a TERRIFYING sweeper, pretty much every defensive check to Volcarona got banned. Not even Toxapex works, because Psychic is on most Volcarona at the moment, and its totally screwed against Psychium Z variants! It can run straight up offensive sets of course, but bulkier sets that can mess with Mimikyu are absoloutly viable as well. The only reason why I didn't put this in S is because of the 4x Stealth Rock weakness, but honestly I'm open to moving it up just because its so hard to check otherwise!
Darkrai: FINALLY, gamefreak made a format where Darkai is good! I've had a bit of trouble fitting this in, but it's pretty versatile for a special sweeper in this format. Darkrai has damn near perfect coverage, Nasty Plot, and if you want to roll the dice, it's very capable of using Z-Hypnosis for Xurkitree styled sweeps! That being said, outside of sleep shenigans, it is weak to Mimikyu, and has issues with Marshadow speed ties and random Scarfers. Still a damn fine mon regardless!
Xurkitree: Oh yeah speaking of Xurkitree, this thing is much more threatening than usual, mainly because this format doesn't have many good Electric-type switch ins. It works pretty much the same as usual, though some of us have speculated about Z-Electric Terrain and Z-Rain Dance Xurkitrees as alternatives to the usual Scarf and Z-Hypnosis shenigans. This thing is still pretty frail though, so don't get too reckless!
Naganadel: Like Xurkitree, a lot of Naganadel's usual checks bit the dust, so stopping this thing directly can be pretty difficult. Like most sweepers, its pretty Mimikyu weak, but after a Speed boost, you pretty much have to rely on Marshadow having an intact Focus Sash to stop a healthy Naganadel!
Toxapex: You'd think that a format that nukes most stall Pokemon would be bad news for Toxapex, but it actually did the opposite! Toxapex is the best check to Mimikyu and Marshadow you can ask for (granted, both of them DO have ways around Toxapex). With most Ground-types being gone and there being a lack of good Psychic-types, Toxapex's only big flaw is its Electric-type weakness. Otherwise, its the premier defensive mon of the format.
Gliscor: My arch nemesis is still excellent in this format with its usual Poison Heal stalling shenigans! However, abusing poison and OHKO moves isn't the only thing Gliscor can do. It also seems to be one of the most reliable setters of Stealth Rock in the format if you're willing to give up some stalling or OHKO power.
Nihilego: Nihilego is a pretty good offensive Stealth Rocker. Beleive it or not, despite its poor defense stat, you can actually survive a Marshadow Close Combat with just 84 Def EVs, so you can do weird stuff that I did like run Red Card + Stealth Rock to screw over Sash Marshadows! However, note that investing 84 Def EVs means you either get a Speed Boost from Beast Boost, or have to lose speed ties with Nihilego to get the SpA boost... Anyways, Nihilego also stands out as a damn good Choice Scarf Pokemon, being an excellent revenge killer of Volcarona!
Rotom-W: Rotom-W is one of the best pviots you could ask for in this format, making excellent use of Choices Specs and Choice Scarf because of it. They can even run Trick to mess up Tangrowth switch-ins! Bulky sets with Will-O-Wisp are also viable to discourage Mimikyu and Marshadow from attempting a revenge kill.
Aegislash: Thanks to the bulk Shield forme provides and King's Shield itself giving Marshadow and Mimikyu a hard time, Aegislash is still a fantastic offensive threat in this metagame.
Hydreigon: You'd think Darkrai would outclass this thing, but Hydreigon has one very important thing over it: U-turn! Thanks to U-turn, you can break Mimikyu disguises instead of letting it set up for free. If you use Choice Scarf, you can even punish Marshadow in a similar way, and also get the jump on slower, bulkier Volcarona if you go mixed with Head Smash (watch out for the accuracy). Even for non Scarfed variants, Hydreigon's access to U-turn is just too sweet to ignore imo!
Araquanid: Araquanid stands out from Rotom-W by having much better Water-type offenses due to Water Bubble, and the Bug-typing giving it a handy Fighting-type resistance against Marshadow. It works pretty damn well on Trick Room teams, but it can also set up Sticky Webs so you can outspeed speedy threats with other teammates! This one was orginally going to be high-B, but I put it in A just because Sticky Webs pushed it past that for me.
B
Tangrowth: While not as prominent of a defensive Pokemon as Toxapex, Tangrowth happens to work pretty well with it. Tangrowth is another regenrator mon like Toxapex, but it does a lot better against Rotom-W, and is also probably the best user of Leech Seed in the format. Just be warned though, its Special Defense stat sorta sucks.
Rotom-H: While the Fire-typing may not make quite as much sense as it does in other formats, Rotom-H is still pretty competent for similar reasons Rotom-W is. As a bonus, it handles Tangrowth and Aegislash much better. Honestly I'm tempted to move this thing up to A, but I want some feedback on that first!
Krookodile: This is possibly the only viable offensive Ground-type allowed here. Certainly not as good as the usual suspects for Ground-types in most formats, but Krookodile can get the job done thanks to Intimidate. Its a pretty decent setter of Stealth Rock, and can also use a Choice Scarf set to surprise Marshadow. Access to STAB Knock Off is nice too!
Gigalith: Gigalith is another viable setter of Stealth Rock, being able to use Sand Stream to boost up its SpD, or Sturdy to have more of a gurantee of set up. Gigalith also stands among the few viable users of Gravity, which can be extremely dangerous if paired with Z-Hypnosis Xurkitree or Darkrai! Also notable, if you use an Adamant specially defensive spread of 252 HP / 4 Atk / 4 Def / 244 SpD / 4 Spe with an Assault Vest, Gigalith becomes one of the best checks to Naganadel and Volcarona in the format!
Ditto: With all the fear of Marshadow turning the tables on sweepers, you can give them a taste of their own medicine with Ditto! However, note that Ditto preforms pretty poorly against bulky Pokemon itself.
Slurpuff: Slurpuff is a more dedicated Sticky Webs Pokemon than Araquanid. You can use Sweet Veil so Xurkitree and Darkrai can't put it to sleep, or you can use Unburden with a berry to activate unburden, and screw Marshadow over harder provided you invested in enough EVs to survive 2 Spectral Thieves (very possible, but the EVs will vary depending on what else you want to survive). It also gets access to Yawn, which, while not as effective without Stealth Rock set up like Hippowdon can in other formats, can still be annoying. There is also that Belly Drum set too, but I've only seen that once, not sure if that's worth it, especially with Marshadow around.
Galvantula: The other webs setter. It doesn't stick around nearly as long as Slurpuff does, but in exchange, its fast and gets access to Thunder Wave, which comes in handy if you need to screw over fast threats like Marshadow as a lead! Compound Eyes also does wonder for it offensively, letting it get away with a more accurate Thunder than usual to hit things hard. You can even choose to pivot with Volt Switch, or you can just hit annoying Electric-types with Bug Buzz!
Aerodactyl: This is among the few Stealth Rock setters to actually outspeed Marshadow and Darkrai, which is pretty neat. Outside of Stealth Rock setting, it also seems to make a competent offensive Pokemon for its speed and decent coverage alone, though its STABs aren't great, having to rely on the shaky Stone Edge. It also gets a cool ability in Unerve, which can mess up some Pokemon that rely on berries to survive stuff normally!
Crobat: I found this to be a nice alternative to Aerodactyl. It's offensive stats aren't as good, but it does get a powerful STAB in Brave Bird, and gets the lovely U-turn to punish Mimikyu and annoying sash things like Marshadow! However, Crobat's coverage as a Choice Bander isnt as good as Aerodactyls, and the recoil means Crobat usually doesn't last that long either. I should also note that Inflitrator is a rad ability for messing with Sub users!
Chandelure: Chandelure is a bit overshadowed by the other Ghost-types, but with Inflitrator, it does fantasticaly well against Substitute Gliscor (well for revenge killing at least), and it has great coverage for a Fire-type as well. You can even use a sash set with Trick Room.
Omastar
Bewear
Alolan Muk
Golisopod (might be C, not sure yet)
Crawdaunt
C
Mawile: Mawile without mega evolving sorta sucks on paper, but it also happens to be one of the few Steel-types in this format that can set up Stealth Rock. If you use Impish and max defensive and HP investment, it can actually set up Stealth Rock pretty well against Mimikyu and Marshadow, and also has Rock Tomb to mess with Volcarona switch ins. It's offenses are pretty pittable when you do this though, and unforutnately, unless you use your viable Focus Sash on Mawile, it can't survive what it needs to without the massive defensive investment. Still, this thing worked a lot better than I expected tbh!
Weavile
Malamar (almost tempted to put this in B but I saw few people using it, + I havent tried it myself)
Scolipede
Eevee
Bisharp
Blacephalon
Gengar
Granbull
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