Doubles yap hoping to get others into it ^~^.
https://pokepast.es/69da27216bd81e72
These are the top 20 Touhoumons and their best sets, at least from a first glance.
Star Sapphire - I think she's probably the best touhoumon in the meta, best compared to Rillaboom in other doubles formats. Fake Out AV pivot with a high bp nuke in Pixilate Tera Starstorm. Very good at clicking Fake Out since there are 0 fairy immunities and she has an exceptional psyspam match up anyway. You could try and fit Psychic STAB somewhere for Medicine and Yamame but I think all of its moves are really hard to replace. See no reason to run another set honestly, especially in a format without item clause.
Iku Nagae - Electric types are great and she can fit on a variety of teams solely because she is a rain match up by herself. Levitate and Multiscale are also undeniably great abilities, can try to use her for powerful Wildbolt Storms and Dracos. Fiery Dance is nice as a set up option, choiced sets and rain teams can add on Flip Turn to maintain momentum, can't go wrong with Tailwind utility or Thunderbolt for an accurate STAB move. Weather Ball is also justifiable, namely on Snow and Rain. I'd say this could be compared to a Flutter Mane? Very versatile offensive Touhoumonthat benefits off a weather and loves to spam a spread move.
Mystia Lorelei - a Dark-type spread move is absolutely fantastic, and Mystia's got all of Fake Out, Follow Me, and Tailwind, making for the ultimate support mon. The combination of support moves makes her impossible to compare to an already existing Pokemon, but she's perfect and awesome to use.
Aya Shameimaru - 165 Speed is ridiculous LOL, I treat her as a Tornadus even if she lacks prankster, hard hitting Flying-STAB and the EV spread I used notably outspeeds Modest Wakasagihime in rain. Has other utility moves like Quick Guard and Taunt to tweak itself for a team, very simple to use goodmon.
Koakuma - She gave me a headache trying to find the right set to put on here honestly, she gets everything and can go in very different ways: Fast and offensive, relying on prankster for utility, or she could also run purely defensive with Snarl Icy Wind and be a longterm field presence. Just as Aya is the Tornadus of Touhoumons, Koakuma would be the Whimsicott of Touhoumons. She lacks powerful clicks like Aya, but has both Prankster Taunt and an immunity to Prankster Taunt, tools like Will-O-Wisp and Destiny Bond are also exceptional! I think the two of them are pretty equal.
Utsuho Reiuji - This is a very unique Touhou, box art legendary level stats immidietly jump out as broken, but Utsuhoh is significantly limited by Klutz, losing both an ability and an item slot. That being said, Utsuho's stats are still hard to ignore, she can blow through a lot of common Touhoumons with her mixed attacking stats, and singlehandidly justifies Skill Swap strats. In a team near the bottom of this post, you'll notice that I used Sagume's Contrary + Parting Shot to make Utsuho an incredible threat with longterm field presence thanks to Assault Vest.
Yukari Yakumo - Best Intimidator hands down, Yukari brings an optimised stat spread and protect-breaking Hyperspace Hole to the table which make her very potent offensively. I think beyond STABs, Yukari is flexible in what she wishes to run, you could use Shikigami Rush and par her with Ran, or add Flash Cannon as a coverage option to hit Star Sapphire. She's probably one of the better AV users and Trick Room setters, even if I prefer Specs.
Reisen Inaba &
Doremy Sweet - I decided to talk about these two together since both are very good psychic terrain setters, I'm sure one will be better than the other after the meta develops, but decided to put them nxt to each other for safety. Reisen encourages faster paced psychic terrain similar to Indeedee-M, though notably a lot better with Volt Switch and a better stat spread. Doremy would be compared to Indeedee-F in that its slow and geared to utility, works with Trick Room stuff well as Psychic Terrain denies attempts from Fake Out to stall turns. Both of these would appreciate Yukari's Hyperspace Hole and struggle against Koakuma most notably.
Eiki Shiki - You can probably do a lot of Judgment combinations here, even a plateless one for strong STAB. I wanted Ghost + Fairy to abuse Black and White (SE moves gain an additional 1.5x boost) as best as I could, but you could realistically run Electric + Dazzling Gleam too. Calm Mind Protect seemed the most appropriate, acting as a very good bulky wincon, Think of Volcarona and Calm Mind Raging Bolt, that's how I think Eiki would play.
Ichirin Kumoi - Best Offensive Trick Room setter pretty easily, has to play like Palafin but those are terrifyingly powerful moves, she could easily break holes in teams with minimal support. The biggest issues beyond having the touhoumons equivalant of Zero-to-hero are probably the reliance on Trick Room and being a single target attacker, but they are all flaws your team won't have a very difficult time covering.
Junko - Hi Junko from madoka magica, didn't know you could also shatter protect with the perfect coverage move. I'd say she can be very similar to specifically Swords Dance Urshifu, as she has a less than stellar speed tier and is a Touhou you're afraid of Protecting against. Junko does have more obvious and reasonable flaws that make her balanced of course, Hyperspace Fury isn't a STAB move and cuts into her bulk with every click, she has a worse offensive typing in Normal, and also has to hold Clear Amulet if she doesn't want to be hindered by Intimidate.
Seija Kijin - Follow Me is a fantastic move. Seija might be frail, but the redirection synergises well with Contrary CC increasing her bulk with every click. She has more unique fighting coverage in speed-boosting Hammer Arm and the very much stupid Triple Arrows, not to mention she also has Skill Swap and Topsy Turvy for shenanigans. I think she has a lot of potential to thrive in the metagame, likely similar to Ogerpon since its an offensive redirector, even if Mystia's toolkit is intimidating.
Wakasagihime - Wakasagihime in rain is probably the biggest builder check in the format, she's the entire reason you run Timid Aya or Swift Swim Iku Nagae, Choice Specs Water Spout in rain is obviously very effective at ripping through the format when positioned well. I'd say this is like Eruption Torkoal in VGC, except of course, its blinding fast instead of slow.
Mayumi Joutouguu - This mon I'm a little clueless on, Mayumi is definitely a good touhoumon but I'm unsure what her true best set is. Marching Orders is insane and fun, but Defiant is also very good, and Stalwart is just as exceptional. I expect her to be very versatile and act like Kingambit maybe; Marching Orders feels like priority, and Kingambit is the most prominent Defiant Pokemon in SV VGC. Notably a Touhou that can OHKO both Star Sapphire and Iku Nagae with her STAB moves.
Sunny Milk - The Fairy/Fire we always deserved, her Fake Out immunity and U-turn enable sets without Protect like AV and Scarf. Just a silly Pokemon that can click STAB buttons vs everything, she might be best represented by Landorus-T? That also had a variety of protectless sets it could run thanks to Stomping Tantrum, and they are very similar in playstyle as offensive pivots.
Momiji Inubashiri - Very simple fast attacker, honestly doesn't matter what move you run last. The immunity to Intimidate is greatly appreciated and lets her trade damage very well. Probably best compared to Landorus-I this time, just a hard hitting attacker that can run a few utility moves if she so chooses.
Megumu Iinzumaru - Weather is good in this format, so screwing over the styles is an immidiete positive for Megumu. I can imagine Trick Room sets being potent but Offensive Tailwind is most likely the easiest, she's a mini Aya with specific benefits in a match up. Think of Tailwind Roaring Moon, just..different. I am giving her the benefit of the doubt a little, maybe too much. There's a very real chance she flops since it's soe asy to add Iku Nagae on your team anyway.
Shinmyoumaru Sukuna - Having literal dynamax is hilarious, she thankfully lacks a flying-type move but still quite strong. Life Orb is the most independent set, using dynamax as a way to break through a check. But Shinmyoumaru could absolutely run a more support orintated build with Gigaton Hammer for burst damage, especially since Max Knuckle is still a great move. Highly doubt she'd be broken in any way since the dynamax is a single turn.
Komachi Onozuka - Spirit Shackle Trick Room drool, she's another self sufficient Trick Room setter that threatens an OHKO on Star Sapphire, pairs well with Ichirin's Fighting-STAB nukes and is very notably a water and fire resist, creating more solid Rain and Utsuho match ups.
Here are a couple of teams I built, many of them are untested
Dragon Dance Chiyari Bulky Offense
Mayumi + Specs Cirno Snow
Yukari + Ran Trick Room
Mayumi + Aya Tailwind
NP Daiyousei Offense
Eika + SD Junko Balance
Utsuho Skill Swap Offense
Yuugi Sand Balance
Wakasagihime Rain HO
Sun Psyspam Semiroom (This one probably sucks)
