https://pokepast.es/2f11fa63fc3b1376
Got into the season late and this team got me to Masterball tier super fast in under 2 days, which I consider pretty good since I don't play BSS Ranked often.
Arcanine checks Zacian, Cinderace, Necrozma-Dusk Mane, etc and is just general Intimidate support that also spreads burns.
Calyrex-Ice is extremely good and often sweeps entire teams before the opponent even knows what's happening. Requires literally no support from my experience and can just use Trick Room on most supereffective hits and sweep. Dynamaxing into Max Hailstorm breaks sashes and gets additional damage on top of it's already extreme damage output. Max Quake makes it even bulkier.
Chandelure outspeeds anything relevant except for Zacian. Scarf Chandelure is faster than Dragapult and offers some level of speed control and the ability to nerf things with Trick.
Buzzwole is a wincon with Bulk Up and walls Rillaboom, Excadrill, Urshifu, etc.
Amoonguss spreads sleep and checks Kyogre & Xerneas.
Gigalith is the special wall on the team. Walls things like Zapdos, Yveltal, Togekiss, Kyurem White, Eternatus, etc. If it's primarily a special attacker that doesn't have a STAB supereffective move, then Gigalith handles it pretty well. Also changes the weather on Kyogre if that matters.