Not Theorymon but I'm also bss qc so:
>Even despite the nerf of Disguise, Mimikyu still retains its position as the prime revenge killer in BSS!
I wouldn't really say Mimikyu's role is exactly summed up as revenge killer - it's got the offensive-defensive utility that allows it to generally stall out most Dynamax attackers without having to spend your own Dynamax and finish them off with boosted Shadow Sneak. It is also one of the best Pokemon to send out in double-downs, the best Pokemon to account for the uncertainty of what 3 they picked in Team Preview, and a competent sweeper on its own right, etc. There's so much to Mimikyu beyond "prime revenge killer" but I do understand the constraints of Character limit.
>Aside of Disguise, Mimikyu's traits include great STAB combination, severely hurting popular threats like Dragapult and Tyranitar,
it is notable that most Tyranitar will carry Steelspike with Weakness Policy which will always beat Mimikyu 1v1 with Dynamax with plenty of HP remaining, even if Mimikyu counterdynamaxes. Perhaps Aegislash or Dracovish (while significantly less popular) is a better example of a Pokemon that Mimikyu actually beats because of its supereffective coverage.
>In addition, Mimikyu makes for a decent user of Dynamax: Max Phantasm drops the target's Defense and, coupled with Swords Dance, enables Mimikyu to potentially overwhelm even defensive behemoths like Toxapex and Hippowdon.
I'm not sure if there's room to mention this but Max Starfall is just as big a factor in Mimikyu beating defensive Pokemon like Hippowdon (and Sylveon), as Yawn won't work with Misty Terrain active.
>Phantom Force, while less reliable than Shadow Claw, gives Mimikyu a stronger Max Phantasm.
The main draw of picking Phantom force is to stall out an extra turn of Dynamax, which is quite relevant as their Dynamax will be completely expended just trying to KO a Phantom Forcing Mimikyu.
Mimikyu is a difficult mon to sum up in 1K Character Limit, but it is absolutely one of the top candidates for a BSS Spotlight because of how dominant it is. It would also be a big help if some of our top tier BSS players like Dragonwhale and Greilmercenary can comment on this so we can prioritize its more important aspects because I think it's inevitable we miss out on some information. Good luck!