Talon Flame and Noivern and Hawlucha are actually great defoggers. A reason Noivern can get annoying is because aside from hitting hard, it can actually afford to run roost and when it gets it, it can only really be forced out by something it cannot damage like a blissey. Bulkier setters cannot really pack enough of a punch to threaten it.
Stone edge is a rare sight on treads and tusk due to them running rapid spin. Even then, without counting abilities, Great tusk who is probably the most offensive of the setters with maximum attack EVs and nature is just barely ohkoing a 2x weak Noivern with 0 EVs in HP and Defense using stone edge 62% chance 80% to 110% damage. Being a Flying type that has some form of recovery in general makes some a viable defogger and it's the hazard setter who has to account for that.
All of those Pokemon having access to Defog doesn't necessarily make them reliable at doing the job.
Starting with Noivern, its Choice Specs sets take Stealth Rock damage every time it switches in, and every turn you waste clicking Defog is a turn you could've used Aerilate Boomburst instead. Heavy-Duty Boots Noivern often doesn't even have room for Defog Either, because without the combination of Super Fang + Taunt + Roost, it's pretty much never breaking Pokemon like Ice Scales Corviknight and Blissey/Chansey. A set like Boomburst / Defog / Roost / Filler is hardly a threat in a metagame with as much potential bulk as we have. This isn't even considering the fact that a lot of common setters destroy Noivern: Garganacl is self-explanatory, Glimmora is self-explanatory, Garchomp threatens super effective Dragon STAB, Clodsire can launch off a Toxic and easily eats if it's Ice Scales, Iron Treads isn't threatened by Boomburst at all and can Knock Off, and Great Tusk often has one or both of Knock Off and Ice Spinner.
Talonflame...is already not a great Pokemon right now, but focusing primarily on its merits as a Defogger: it has a bad matchup into any of the Rock-type setters and doesn't really want to take Knock Off from either of the Paradox Donphans. Giving up options like Swords Dance, Taunt, Will-O-Wisp, and U-turn to Defog with a Pokemon that loses to good setters is just a no-go more often than not.
Aside from w/e its matchups into entry hazard setters are, Hawlucha is by no means what I would consider a viable Pokemon right now. It has mediocre offensive stats (Adamant is slower than EVERYTHING, Jolly is to weak to kill anything), has loads of weaknesses to common coverage (Fairy/Electric/Ice/Flying), and even on a niche set, definitely can't afford to be clicking Defog on any of the setters in the tier. If it's Defog, it also just becomes setup fodder for just about everything; after all, it's not as though it's strong enough to beat Fur Coat Pokemon.
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