Alright, here's my takes on our current contenders!
Tigire: It's similar to Flamyle, kinda, but trades the steel trapping for better offenses and Fire Lash, making it much more capable as a breaker. I feel like this does more to stratify, rather than diversify, the Fire types we've currently got. Right now Flamyle is a trapper that can also be a decent offensive scarfer; if Tigire were in the meta there's be no reason to use it except to trap things in most cases. Besides that there's nothing really wrong with this mon. It's cool and flavourful, I just wish it were a little less similar to Flamyle.
Terringale: If it didn't have Innards Out, maybe. I think the pressure it would place on offensive teams would be too much since Innards Out would be a free kill in many cases even if it takes some damage first, and even ignoring that it's no slouch on it's own, with a nice typing and offenses.
Dolphena: I really like this mon actually. I think that Competitive can be quite good in this metagame, as there are a lot of viable Defoggers, Sticky Web is a promising playstyle, and Intimidate exists too. Psychic Surge diversifies it too, giving it another avenue to hit hard, and can also support Unburden Toados with Psystrike. It would be nice to get a Dragon type that's not slow, too. So I think I might be voting for this one.
Dinodily: I actually like Dinodily too. Its speed tier is very nice without being overbearing, and Steel is a good type to spam since good physical walls like Baloon and Mega Chillyte are weak to it. At the same time Dinodily isn't that strong, so it shouldn't end up being overbearing. It has nice coverage for Steel and Water types, and has some utility with Switcheroo and Rapid Spin, giving it some utility to provide for the team, as well as being able to saddle those switch-ins it can't touch much with a Choice Band. It's fairly one-dimensional but I think it could be a good addition.
Fluffora: Although it is very passive and lacks recovery, I think Fluffora's capacity for support could be useful. Another Spikes setter would be nice, and Snow Warning would breathe new life into Slush Rush mons. Voltecta's already pretty good, but regular Chillyte is pretty difficult to justify using right now. In Hail, it would be able to outspeed most things and make use of its good coverage, and it could also set up Aurora Veil, giving it a completely unique niche. Although Fluffora on it's own isn't that great, the support it provides is just so unique that I'm considering it.
Deworb: It can pivot in on Chillvark, but besides that, it actually doesn't really accomplish all that much besides being able to pivot out again. It has nice bulk, similar to Aquatopus, but Aquatopus has Unaware and more min-maxed stats (it can actually speed creep Chillvark), giving it an extra edge in walling things. So I'm not crazy about it, really.
Doomster: Doomster is pretty cool. It reaches the key speed tier of being faster than Electritar at +1, so it should be able to put in work against more offensive variants. Its STAB combo is decent, although it it isn't great against Fairy types, which seems like a real problem since Doomster doesn't really have strong Poison or Steel moves.... until you realize that the only real specially bulky Fairy types (Bellena and Biceon) are both weak to Ice Beam. The biggest issue for this mon is Gorilax, which walls it to hell and back, but that's nothing new. It can pivot out of predicted Gorilax switch-ins with U-turn, so it doesn't really lose any momentum, or just keep up the pressure with Nature's Madness or something. I think Doomster could be pretty nice.
Dinotic: This would be another good option for a Dragon type. It's not as strong as it looks due to its somewhat lacking coverage and can be checked by Bellena or Giranium. Its Speed tier is also not super impressive before it gets an Agility off. I agree that it would be great at cleaning up offenses but not too overbearing due to the turn it needs to set up, and the lack of recovery. This one is nice but idk if I like it more than the other Dragon types here.
Gothoose: Gothoose would be a fast physical wall that checks physical Ghost types really well, and can also play as an anti-lead thanks to Taunt, letting it beat hazard setters like Ramron and Albatrygon. It also fills a similar role as Ramron, by being able to shut down Dropacle and Specyte. I feel like it would be kinda annoying to face and further disincentivize physical attackers, even though it plays differently from most of the walls we've got so far and doesn't seem broken by itself. Not sure about this one.
Lots of good choices here! I'll have to give it a bit more thought before voting starts.
Tigire: It's similar to Flamyle, kinda, but trades the steel trapping for better offenses and Fire Lash, making it much more capable as a breaker. I feel like this does more to stratify, rather than diversify, the Fire types we've currently got. Right now Flamyle is a trapper that can also be a decent offensive scarfer; if Tigire were in the meta there's be no reason to use it except to trap things in most cases. Besides that there's nothing really wrong with this mon. It's cool and flavourful, I just wish it were a little less similar to Flamyle.
Terringale: If it didn't have Innards Out, maybe. I think the pressure it would place on offensive teams would be too much since Innards Out would be a free kill in many cases even if it takes some damage first, and even ignoring that it's no slouch on it's own, with a nice typing and offenses.
Dolphena: I really like this mon actually. I think that Competitive can be quite good in this metagame, as there are a lot of viable Defoggers, Sticky Web is a promising playstyle, and Intimidate exists too. Psychic Surge diversifies it too, giving it another avenue to hit hard, and can also support Unburden Toados with Psystrike. It would be nice to get a Dragon type that's not slow, too. So I think I might be voting for this one.
Dinodily: I actually like Dinodily too. Its speed tier is very nice without being overbearing, and Steel is a good type to spam since good physical walls like Baloon and Mega Chillyte are weak to it. At the same time Dinodily isn't that strong, so it shouldn't end up being overbearing. It has nice coverage for Steel and Water types, and has some utility with Switcheroo and Rapid Spin, giving it some utility to provide for the team, as well as being able to saddle those switch-ins it can't touch much with a Choice Band. It's fairly one-dimensional but I think it could be a good addition.
Fluffora: Although it is very passive and lacks recovery, I think Fluffora's capacity for support could be useful. Another Spikes setter would be nice, and Snow Warning would breathe new life into Slush Rush mons. Voltecta's already pretty good, but regular Chillyte is pretty difficult to justify using right now. In Hail, it would be able to outspeed most things and make use of its good coverage, and it could also set up Aurora Veil, giving it a completely unique niche. Although Fluffora on it's own isn't that great, the support it provides is just so unique that I'm considering it.
Deworb: It can pivot in on Chillvark, but besides that, it actually doesn't really accomplish all that much besides being able to pivot out again. It has nice bulk, similar to Aquatopus, but Aquatopus has Unaware and more min-maxed stats (it can actually speed creep Chillvark), giving it an extra edge in walling things. So I'm not crazy about it, really.
Doomster: Doomster is pretty cool. It reaches the key speed tier of being faster than Electritar at +1, so it should be able to put in work against more offensive variants. Its STAB combo is decent, although it it isn't great against Fairy types, which seems like a real problem since Doomster doesn't really have strong Poison or Steel moves.... until you realize that the only real specially bulky Fairy types (Bellena and Biceon) are both weak to Ice Beam. The biggest issue for this mon is Gorilax, which walls it to hell and back, but that's nothing new. It can pivot out of predicted Gorilax switch-ins with U-turn, so it doesn't really lose any momentum, or just keep up the pressure with Nature's Madness or something. I think Doomster could be pretty nice.
Dinotic: This would be another good option for a Dragon type. It's not as strong as it looks due to its somewhat lacking coverage and can be checked by Bellena or Giranium. Its Speed tier is also not super impressive before it gets an Agility off. I agree that it would be great at cleaning up offenses but not too overbearing due to the turn it needs to set up, and the lack of recovery. This one is nice but idk if I like it more than the other Dragon types here.
Gothoose: Gothoose would be a fast physical wall that checks physical Ghost types really well, and can also play as an anti-lead thanks to Taunt, letting it beat hazard setters like Ramron and Albatrygon. It also fills a similar role as Ramron, by being able to shut down Dropacle and Specyte. I feel like it would be kinda annoying to face and further disincentivize physical attackers, even though it plays differently from most of the walls we've got so far and doesn't seem broken by itself. Not sure about this one.
Lots of good choices here! I'll have to give it a bit more thought before voting starts.