First the TR setters:

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: Brings the coveted Teleport + Trick Room combo that sets TR and gets in the breakers safely, which let Porygon2 enable TR to be a legit threat in Gen 8 OU Singles. Trace lets Chansey copy all sorts of useful abilities, like stopping Trick on Dengo-evos, Punk Rock softening Boomburst on Toxtri-evos, switching into Intimidate-Gyara evos, etc.

+

: Just a good fat Unaware Defensive Wall + TR Setter that can sit on offensive threats for days. Colbur Berry lets it trade Willo’ against Dark mons like Bisharp and Qwil.

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: This is a legit great offensive lead that stops hazard stacking / Taunt with Magic Bounce and usually nets a few KOs with its strong/perfect coverage. Ground + Fairy is great both offensively and defensively, and Ice Punch makes Gligar a poor counter. Rocky Helmet lets it break Sashes (Samurott-evos) or finish weakened stuff just by switching in, saving TR turns.
Now the heavy hitters:

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Surging Strikes and Unseen Fist together break through so many standard TR counters it isn’t funny - Intimidate, Screens, Sturdy, Sashes, Substitutes, Defense-boosting, Protect. My logic? Put Urshifu and Band on the hardest hitting LC-Mon and just break stuff. Head Smash Breaks water resists, CC breaks Corv+Dipplin, Aqua Jet for prio. Nuff said.

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: By far, my favorite mon of this team.
Ground + Ice STAB is really good, and putting more attack power on them is really, really good, but what makes this set
stupidly good is Queenly Majesty. After all, what good is power if you get forced out by all the strong priority flying around everywhere? (QM also protects from Prankster, fyi.)
Loaded Dice Icicle Spear has the same utility S. Strikes does beating Subs/Sturdy/Sash does while also not making contact so no Rough Skin/Helmet recoil, while Knock Off hits Balloon + Dengo-evos hard and removes items and U-Turn keeps momentum.
At this point, the team was pretty good but still susceptible to running out of Trick Room turns to support the breakers and thudding into Iron Defense mons, especially ones that resist Surging Strikes like Shellder and Sliggo. I was also a bit weak to Ceruledge-evos since Dusc cannot burn it. I also could use a Water resist, as well as another Dark and Ghost resist to take some pressure off the TR setters.
Turns out, the best way to solve all these problems was to win the speed war from the other end.

+

: Wild card, baby! Scarf Protean Fraxure hits hard and fast outside TR, complementing my slow breakers, putting the opponent in checkmate situations where they lose the speed war no matter what. It’s also very defensively unpredictable, since it changes its typing with Protean. For instance, quickly becoming a Fairy type lets it be surprisingly immune to Dragon and resisting Fighting is quite handy.
Dragon + Dark as a base defensive typing provides nice synergy with the team, letting it get in against Araquanid and Ceruledge-evos, I otherwise would struggle to switch in on.
Flower Trick lets it crit through screens the same as Surging Strikes, while also giving me a different crit typing to bypass Water types. Defensive Dragon types like Dipplin and Sliggo could still give trouble, but Trick Scarf totally ruins them. For the last two moves I chose Throat Chop and Play Rough, both of which hit Ceruledge-evos for SE damage, whether they are Normal+Ghost or Dark+Ghost. Throat Chop is chosen over Knock Off so I can still use a Dark STAB on something I’ve tricked a scarf on to, while also making Frax immune to Boomburst and other sound moves.
Games:
https://replay.pokemonshowdown.com/gen9crossevolution-2326532022
https://replay.pokemonshowdown.com/gen9crossevolution-2328420654
https://replay.pokemonshowdown.com/gen9crossevolution-2326167870