Slowghast: Here's a defensive mon / bulky sweeper that has a lot going for it. Tidy Up is the main move it uses to become a slow-burning setup sweeper while removing hazards, or alternately it can lean into a more offensive set that uses the move. I don't think Cosmic Power + Body Press impresses me much thanks to having some big 4MSS and being easy to shut down. It has a nice offensive movepool on both siides, but I think its stats are too flat to attempt any other sets really. Although it's pretty bulky and has great utility and recovery, its general lack of resistances, vulnerability to status, and exploitable special defense means it is far from broken.
Geneking: With Stakeout, a pretty usable STAB combo, and good coverage for Steel-types in Bonemerang and Focus Punch, Geneking seems like a fun breaker. Focus Punch especially is a diabolical move to run with Stakeout, but I think Bonemerang is what it would prefer currently to hit Radimite. It has some major issues, such as a big reliance on Stakeout for most of its power and needing to lean heavily into its high natural bulk to take hits against faster foes. There are currently a handful of mons it can force out, but in situations where it can't force a switch it can get locked in and taken care of. Unlike a breaker like Hunttar, Geneking would be much more prediction reliant for hardly any benefit; although it can technically beat down anything with the appropriate move, it finds itself in bad 50/50s in situations where it can't just click Play Rough. While bulky, Psychic / Fairy isn't great defensively which belies the bulk a bit. It just doesn't really have enough useful resists.
Draunker: Pretty neat mon but most people here seem very opposed to fast Shed Tail. I'm not too opposed to Shed Tail personally, but this mon has too much going for it between the good speed, average HP, and respectable STAB + coverage + recovery too.
Solaroo: I am not impressed with this mon. Although it has huge special bulk, lack of recovery and utility makes it difficult to use, and offensively it just doesn't have the statline to snowball with As One. Flamester is a much better Fire-type than it overall in basically every aspect, with actual utility and recovery as well as much better offensive stats. The only thing Solaroo really has is the obscene special bulk but it falls short in every other way.
Chimeseed: I really want to like this mon but it falls a little flat in some areas. It has pretty high balanced stats and a typing that I think gets a lot of flack, as its solid offensively in terms of neutral STAB coverage and has just as many resistances as weaknesses. Specs and Meteor Beam are both hard to answer defensively with their high power STAB (Leaf Storm) and ability to boost up while remaining healthy against weaker defensive mons respectively. Shore Up or Substitute on the Meteor Beam set lets it persistently dominate fatter cores. This mon does have some pretty big shortcomings though. It's got major weaknesses and is slow enough to be revenge killed relatively easily, even though it has good bulk. That relatively mediocre Speed is a big stopping point for a hypothetical Specs set, especially one that would love to be able to run Modest. Surge Surfer would make it a speedy revenge killer with great power too, but that is so speculative that it's not really worth considering. I have really mixed feelings here, but overall it probably errs too far on the weak side.