I beat it first try, but I barely scraped by. :O
I had Mimikyu in lead, who got completely destroyed in 1 hit. I sent out Drifblim, tried to use Shadow Ball, but it was also destroyed first. Next up was Sableye, I used Fake Out to get a tiny bit of damage, then died next turn. I sent out Pallossand next, it somehow survived with 1 HP, so I was able to get a shadow ball in to do some mild damage. My Alolan Marowak was up to the plate, but I just used him to be able to get a revive in for my Drifblim. After Marowak was out, I sent out Drifblim. Luckily for me, when it got hit, it gave one of those "Your pokemon kept itself from fainting to prevent you from being sad" things, so I was able to use Explosion for some decent damage. The next turn I used Trevenant just to use a revive on Mimikyu. Finally, I used Mimikyu's special 'Let's Cuddle Forever' Z-Move, and that was game.
So basically, I got through it much more by luck than any skill, but it was still pretty epic. :D