I've already stated my opinion on Primeape, but i'd liek to revise it slightly. It's power really is underwhelming as a Scarfer unless you're using Close Combat, and even then it only manages to do like 80% vs the likes of Sawk. Punishment isn't even worth using (w/ Scarf) as it is incredibly weak vs everything bar NP Missy. If it didn't get U-Turn I would be suggesting it for like B-, but U-Turn on it is very good on it for momentum vs Psychic types, however it's still pretty useless vs all Ghost types. Banded is a Faster Weaker Sawk that fails to wall break anywhere near as well (because no Mold Breaker + and less Atk) but can sweep a lot more efficiently, however it is very physically frail and can be revenge killed by priority and can't really switch in on anything. It is better than I said in my first post, however it does not deserve to be among Sawk and the other S ranks.
Gurdurr is an incredible Offensive Check to numerous Physical attackers, and even some Special Attackers. Eviolite allows it to tank hits, and Base 105 Atk + Drain Punch means it can heal up a lot of health vs Offensive Pokemon, beating almost all of them 1 on 1. It has access to 2 great abilities, Iron Fist makes Gurdurr hit very hard straight off the bat and allows it to 2HKO bulkier pokemon like Emboar in 2 hits with Drain Punch + Mach Punch. Guts allows it to not care about Burns, and want to be paralysed, increasing it's offensive prowess and stopping it from being Toxic'd. It has access to Ice Punch to nail things like Vileplume, Altaria + Torterra, or Payback to beat most Ghost types 1 on 1. Mach Punch is an incredible tool, allowing it to reliably revenge kill pokemon such as Houndoom, Zangoose, Sawsbuck, Kangaskhan, Crawdaunt, Klinklang Etc. The only thing wrong with Gurdurr is that it requires a bit more support to flourish since it is rather helpless Vs Bulky Poison types like Weezing + Garbodor, and Bulky Psychic types like Musharna + Mesprit, whereas Sawk has Mold Breaker EQ + Primeape has U-Turn for scouting and momentum. But it performs it's role as a bulky Pivot/Sweeper so well that it deserves an S rank imo.
Mandibuzz is absolutely incredible in the current meta, it is extremely effective against basically all the new drops, either shutting them down with Taunt or smacking them hard with Foul Play. Mandibuzz is probably the best Stall breaker in the tier, it's Dark typing means it's never threatened by Calm Mind Musharna, it has great Speed for a Wall, so has access to a very fast Taunt, shutting down almost all Defensive pokes before they can move. It also has reliable recovery in Roost, and STAB Foul Play which can deter Physical attackers from setting up, and even revenge kill some of them (KO's +2 Bulky Sam after rocks). It also has access to Toxic to cripple the Walls it shuts down and Whirlwind to phaze out threatening pokemon or rack up residual damage with Hazards. Some Flaws Mandibuzz has are that it really hates any sort of status, especially Toxic or Paralysis, as they significantly reduce its Walling/Stall Breaking capabilities, it also really likes having a spinner, as Stealth Rocks turn a lot of would be 3HKO's into 2HKO's, however Claydol is a great partner for Mandibuzz, so you don't really need to sacrifice a team slot to spin. Again despite some of its flaws it Stall breaks + Walls things so well it deserves an S rank.
Zangoose is just an absolutely incredible Wall breaker/Sweeper/Revenge killer. It's STAB Facade is incredibly powerful, on par with CB Sawk's Close Combat, except it can be spammed against common bulky pokes like Weezing, Musharna + Mesprit and rack up 2HKO's without a problem. It also has coverage with Close Combat + Night Slash to nail Rock/Steel Types and Ghost types respectively, so it has basically 0 counters. And Finally Quick Attack deals around 50% to most offensive pokemon, so is a very effective revenge killer and hits a nice speed tier with 90 Speed. It can perform well against every playstyle, it wall breaks against Stall, it straight up 6-0's Buky Offense, and it can get a lot of kills with Quick Attack + Facade against Offensive. It's held back by Toxic Orb putting it on a timer and it's relatively frail, but it's damage output is so incredible whilst it's alive that it's worth it.
Ludicolo has incredible typing for an offensive or defensive role. Offensively it can be a self sufficient Rain Sweeper that gets STAB on Hydro Pump + Giga Drain meaning it is very hard to switch into and very hard to wear down, and it gets Ice Beam to round off coverage. It is threatening to basically every team unless you are a pokemon from it's very small list of Checks. It can also go Sp Def with Sub Seed as well which is very good thanks to it's great unique Water Grass tying and good Special Defense. It's able to Check basically all Water types and can stall out a lot of Special Attackers thanks to Giga Drain, Leech Seed + its natural great Sp Def.
It's Acrobatics set is actually very good at softening up the opposing team. STAB Acrobatics Flying Gem despite coming off pretty low attack still hits very hard and will OHKO pretty much any offensive pokemon, and 2HKO most bulkier pokes after rocks. After activating Unburden it outspeeds the whole tier, and is then free to Will o Wisp or Destiny Bond it's revenge killer, so against most bulky + offensive teams it gets 2 kills or 1 kill and cripples a mon with Will O Wisp. It has a lot of Useful Immunities and Resistances too so doesn't struggle to find an opportunity to come in and activate Unburden. It's only real flaws are being weak to rocks and being pretty much deadweight vs Stall