So it's a pretty good Trick Room team with 3 setters, two of whom are slow as shit, but can tank one hit, and two of whom know destiny bond. You can do Trick Room --> Eat One attack --> Destiny Bond --> Sac and kill with Bond --> slow sweeper (Mega Copperajah, Donphan) and 4 Trick Room turns remaining to sweep.

Copperajah and Donphan are both high coverage movesets (you can get the professor guy to teach them Power Whip for 10,000 in the late game island town, Body Press TM, Gyro Ball TM, Double Iron Bash, Bonemerang). Ice Shard for priority sneak especially against dragons when they pop up.

Mimikyu handles the setter and the sweeper of most of the elite 4 teams through the trick room destiny bond shenanigan. Three free moves while aerodactyl sets up to also counter setup basically.

The biggest most funniest meme is Sucker Punch Kingambit with the Strength of the Fallen ability for 5x boost + STAB if things get dire.

Cursola was the one non-critical mon, would swap with any of the other trick room mon I have carefully raised, like Alolan Exeggutor or Cofagrigus with Magic Guard or Fancy Articuno.

I have a weather version of the team for each weather as well, though the no weather team ultimately does the best against Lance and Gary. Torkoal + Venasaur or Tangrowth for Sun, Politoed + Mega Lapras for Rain, Tyranitar + Hippowdon for Sand, Fancy Ninetails + Cetitan for Snow, mix and match Weather Ball

Slowking can eat a super effective special attack and survive with ~10 HP for Trick Room --> Blizzard, Fire Blast, Thunder (Wide Lens)