Dumb Pokemon. The only reliable defensive answer to it in the tier that I can think of is Fire Tauros, which isn't an OU staple so you know how this goes. Even then, it's prone to getting worn down, especially if not running Leftovers + Protect. What should be good switchins to it, such as Corviknight, Dondozo, and physdef Rotom-W are all broken down by Chien-Pao's Banded Crunch, especially if Tera Dark and Arceus help you if Defense drops get proc'd. It's offensively hard to check, too. It has a blistering Speed-tier which lets it outrun everything relevant besides +Speed Pult, which gets sniped by Ice Shard and Sucker Punch anyway, and Tera removes its 4x Fighting-weakness meaning Body Press from things like Corv or unboosted Garg, and Mach Punch from Sash Breloom won't OHKO from full anymore.
I feel the Banded set is the scariest, but Boots is also hella hard to wear down while giving it move-freedom. Also one of the scariest threats on Screens hyper offense, too. Just won't die, especially after Tera. Ban this thing.
3 (I voted 4 in the survey but kinda regret it now lol)
Not as overbearing as Chien-Pao, but Garganacl is still extremely annoying. It's arguably the best Tera user in the tier by far, and the combination of its signature ability, its signature move, reliably recovery, ID + BP, and fantastic bulk makes it the best defensive piece in the tier, too. There are ways of stopping it, such as Tricking a choice item onto it, knocking its Leftovers off forcing more Recovers, Great Tusk without Garg using Tera, etc, but it's arguably one of the hardest mons in the tier to gain progress against while it progresses very easily against yours. I wouldn't say it's *broken* but it's bordering brainless imo.
Don't have as much to say on Gholdengo. Definitely not as opposed to this mon as I was at the start of the meta, but the Cloak set is bordering too good. Also enables spike-stack hella hard, but not impossible to deal with considering Tusk exists. Keep on the radar, but I think over time, this mon will be more healthy for the tier.
1 (I voted 3 before, but I changed my mind again :p)
Not much of a threat at all tbh. Yeah, it can snowball pretty hard, but it requires much more set-up to do so than something like Blaziken did in past gens, which usually just needed one SD to cleave through teams. It just doesn't have the raw breaking potential, with Stored Power needing multiple boosts and Dazzling Gleam does pitiful damage if you don't Tera-Fairy, and running Tera Blast into Tera-Fighting REQUIRES you to Tera this mon otherwise you're walled by Dark-types forever. Not problematic in the slightest.