Pyroar is strictly inferior to all of Delphox, Emboar, Moltres, and Houndoom as a Fire-type, as all of them are way better wallbreakers in the tier, and Pyroar does nothing that they can't do, while all of them bar Houndoom have better movepools and more power or better bulk to make use of than Pyroar. Pyroar's only niche has always been beating Doublade and now we have Houndoom to do that, plus Doublade is no longer a dominant threat, so that niche is gone too. Remove it imo.
I feel like Mismagius is fine for an analysis. It is still an alright Nasty Plot sweeper in this metagame and it's usable because it sets up on Cress and after setup it sweeps fairly decently with Shadow Ball and Dazzling Gleam and a decent Speed to boot, and it has usable options like Will-O-Wisp, Taunt, Substitute, or Destiny Bond in the last moveslot which can make Mismagius decently annoying. I think a stallbreaker set isn't out of the question either. I mean it's not like Mismagius is anything amazing or anything but it has enough of a niche to keep its analysis imo.
Barbaracle is a mediocre sweeper that in theory is supposed to work but in practice it's just really underwhelming. It has a hard time setting up and it's pretty easy to deal with even at +2 because it relies on inaccurate moves, is easy to revenge kill, etc. Slurpuff is way better as a cleaner, as as things like Tyrantrum imo and even Shell Smash Omastar is better than this thing lol.
Miltank sucks in NU but idk I haven't used it so I don't really have much to say about it lol.
Linoone and Mightyena are pretty gimmicky, everything else seems kinda...outclassed.