I just got back into playing mons after skipping Gen 8. I gotta say, Zamazenta and Kingambit might be two of the funniest, most skill-less mons, noob-friendly mons I've ever seen allowed in a tier. When making a team around Zamazenta and Kingambit, what threats should I be looking out for? What teammates are good for enabling their reverse 6-0 sweeps?
The main threats to the combination of Zamazenta and Kingambit are as follows: Zamazenta (lol), Iron valiant, Gholdengo Tera-Fairy NP Dazzling Gleam, Iron Moth, Enamorus, Moltres, Gliscor depending on the set, Roaring Moon forces Zamazenta's Tera, and Wisp Pult and Primarina are kinda annoying too. Hazards are also a bit of a problem for your own Zamazenta and Kingambit.
I probably missed 1 or 2 since the list is a bit large but knowing that these are the problems here's what I'd do if you want to abuse Zamazenta and Kingambit. First none of those Pokemon use Heavy Duty Boots besides some Zamazenta, Dragapult, and Moltres. Having some sort of Stealth Rocks + Spikes stack can he crucial in chipping stuff like Leftovers Zamazenta, Iron Moth, Enamorus, Iron Valiant, Roaring Moon, and Primarina. So with Zamazenta + Kingambit you can pair it with something like Samurott-Hisui or Gliscor for a spiker slot.
You'll also notice a running theme with those Pokemon is that they are mostly special attackers, so a general check to special attackers like Assault Vest Primarina can help as well. This is especially nice since Primarina can Flip Turn on Slowking-Galars to bring in Kingambit safely without any hard predictions needed. Primarina also handles other Zamazenta decently enough, and Moltres very well. If you aren't liking Assault Vest Primarina you can also try Sp.Def invested Slowking Galar, or Max Defense AV Slowking-Galar (max defense helps vs Zamzenta).
Lastly in terms of hazard control, the options are quite limited since. Kingambit + Zamazenta is 85% of the time going to be Bulky Offense so fitting Corviknight will be very difficult unless it's a balance archetype. Glimmora also is moreso used on Offense or Hyper Offense rather than Bulky Offense. You're only other more feasible options are Great Tusk, Cinderace, or maybe Iron Treads if your team becomes offensive enough.
In terms of Moltres/Wisp Dragapult specifically, you could use Tera-Fire Kingambit, and Resto Chesto Iron Defense Zamazenta.
Hope this helps and good luck!!