
SD Aegislash is the only good Aegislash set anyone who tells you otherwise is a liar. Set's from the compendium

Bulu's here to soft check Mega Chomp and counter/set up on shit like Ash Gren, Chomp, and Gliscor. It also gives Aegi terrain to both heal and set up vs weak Grounds and shit while also benefitting from its ability to break fat Grasses and Psychics and just the kinda stuff that beats this set anyways. The spread is taken from
adsam letting it survive +2 M-Chomp Fire Fang while having enough bulk to beat Ash Gren and enough speed to tie Skarm and beat Mawile

Gastrodon's here to counter Volc/CM Fini/Koko/Zone/Zapdos, check Gren/Tran/CM Clef and just be an annoying Spdef tank. Spread's basic stuff. EP>Scald to nail Tran better without getting nerfed by terrain and/or burns.

Originally this was Corv but I really wanted something that could deal with Lop/Kart/Weavile better longterm while still Defogging and well, this was the best option I had. Defog>Spikes is obvious, spread maximizes physical bulk while letting it creep Mawile though u can go Naskarm to get the jump on Zone or go Shed Shell>Helmet to do that without changing the spread. Helmet is preferred to accumulate chip and because the team really has few ways of actually securing any sort of progress.

Originally this was Tran but I needed something for Kyurem so here we are. Spdef Rocks Clef gives us Rocks while giving another Ash Gren check, a hard Kyurem check (even to Specs with Terrain which is nice), and a cleric, which is great because the team is very status weak, especially the two sweepers. Also can emergency check Lopunnies and shit.

I bounced back and forth on this for a while and while the original "final" draft had Moltres since it gave u a (less) Pursuit-weak Zard answer, I ultimately decided to go with Mega Latias since it still gave the team a Zard answer, it gives the team a Kart answer that can outspeed SD sets, it can give a soft Lop check, and a way to deal with Pex. Set and spread are standard stuff.
The team is ultra passive in general relying on the bulky setup sweepers and chipping stuff with Helmet+ Toxic to win. If u wanna be defensively secure to the max, u can go Molt>Latias but u get super passive