Magnemite you might want to link / quote our posts in the archive because they contain reasoning and stuff
My vote goes to whoever posts standard defensive Missy + Memento because it's probably the best one, but here's something a little more "creative":
Misdreavus @ Eviolite
Ability: Levitate
EVs: 252 HP / 240 Def / 16 Spe
Timid Nature
- Mean Look
- Perish Song
- Foul Play
- Pain Split / Will-O-Wisp / Taunt / Protect
Misdreavus can lure in all the bulky shit and status absorbers like Roselia, Lickilicky without DTail, RestTalk Wrath, etc and trap them before removing them entirely which is cool for its teammates. At the same time it still forces out stuff like Tauros and other physical stuff thanks to Foul Play and / or Will-O-Wisp. Pain Split keeps it healthy while Taunt prevents Roar from the likes of Avalugg, and you can even run Protect, so it depends on whether you want Missy to have better all-around utility or just be better at Perish Trapping bulky stuff. Unfortunately it doesn't do as well against offensive teams without any bulky thing to trap but this is the best way to remove bulky opponents on balance / bulky offense.