So we start with the big ice man himself, ofc, and I decide to go with full room, so I'll need a setter...
So Abomasnow is weak to literally everything, and the only shared weakness between Diancie and Abomasnow is steel, so we'll have to consider that later (but I'll probably forget or say fuck it). Weakness policy Diancie is strong AF and a cool setter.
Here I add Scrafty for the fake out support, and it's also a pretty bulky mon that can hit pretty hard with knock off. I'll probably always lead Scrafty since it either forces protect or makes a mon flinch and it pretty much means I always get up TR barring a Mega Kang lead.
Here I do something kind of cool, I add Gothitelle as my second setter, but instead of Shadow Tag I have competitive because you can catch Lando's and because there's no real need for s tag on this team. The goth is EV'd to live a modest hydrei dark pulse with the rest in physical defense.
I think I use Azumarill a lot in these competitions but it's one of my favorite mons to use, it's just flat out good. Sometimes instead of going for TR you can do a Helping Hand Aqua Jet combo with Goth and Azu that your opponent will just not expect that can net you a crucial KO.
IT'S GOODRA TIME
I can finally use modest Goodra! I basically gave it draco, 2 coverage moves, packed in a little HP and a lot of Def, maxed it's special attack, and boom! Goodra time!