TSR didn't mind me posting a team so here we go. The team's basic makeup is nothing weird; just a simple triple dragon + dual steel + fairy. Acid Downpour Hydreigon + another dragon isn't exactly something that needs to be explained much. The set allows Hydreigon to lure things like Azumarill, Primarina, and Mega Altaria. As a result and with the other team support, I practically never clicked Poison Jab on Haxorus, so I just went with a dual dance set. You can use Poison Jab if you want, though, not a big deal. I have 2 Choice Scarf users just because I found that it was a lot easier to play around threats that way. Scarf Magneton on its own is not that fast against opposing setup sweepers; Scarf Latias is fine but without Scarf Magneton as well, the team straight up loses to Alolan Muk + Cobalion or w/e else teams. Healing Wish synergises well with Azumarill and Haxorus as well. I originally had Life Orb Draco Meteor, Thunder, Hidden Power Fire Latias, but Choice Scarf worked better overall. Cobalion's set is a weird choice, but Life Orb Hidden Power Ice + Iron Head KOes Gliscor, Iron Head 2HKOes Azumarill after Stealth Rock, and Close Combat 2HKOes Rotom-W after Stealth Rock. Overall, the increased damage from Life Orb is greatly appreciated on a team like this that would rather have Cobalion outright damage things for more. The team is a little weak to Gliscor; otherwise, I'd have gone with a simple Swords Dance set, but Swords Dance has awful synergy with Life Orb for Cobalion. I've tried other Moves over Hidden Power Ice like Taunt (useful for stopping opposing Defog, etc) and Thunder Wave, and while they have their own utilities so you can use them, Hidden Power Ice is just what I stuck with. I can see both Choice Band Azumarill and Belly Drum Azumarill working here, but for the record, my Azumarill spread only outspeeds up to Alomomola; if you decide to run Belly Drum instead, make sure you run more Speed to creep Mantine before they can Haze you.
Not much needs to be said regarding how to play this tbh. Get up Stealth Rock and pressure / lure the hell out of the things that trouble Haxorus. Use the 2 Scarfers on the team to pivot around threats. Make use of Azumarill's amazing typing to switch into Dragon- and Fighting-types that give the rest of the team issues and punish them accordingly. Healing Wish Latias is there for backup wherever necessary. Yes, I got really lazy here after typing everything twice, but thanks for reading.