I don't know if anyone agrees with me, but Chesnaught in solid B Rank sounds like a good choice. Its amazing typing with ability allows it to wall some powerful threats like Excadrill, Kabutops, non-Sludge Wave Gengar, Dragonite, Terrakion, Landorus-T, Tyranitar, Crawdaunt, and Bisharp. Most notably, its signature Spiky Shield has amazing utility coming in on Outrage'd Dragon-types and giving them chip, Leech Seed, and possibly confusion damage which can wear things down really quickly. It can set up its own Spikes and creates an incredible and common core with SpD Heatran (one of the best reasons to move it up) and it can completely cripple things coming in with Hammer Arm because it lowers its Speed meaning things like Garchomp can finally outpace Latias allowing it to kill it or do massive damage to a switch in. Wearing down things is really useful for offensive teams because it lets Excadrill beat Garchomp, Mega Houndoom beat Azumarill, etc. Add to the fact it has an amazing typing and it is really easy to see why Chesnaught is an underrated and good threat. Move it to B
Next and finally, I really feel like Cloyster should go from unranked ranked. Here me out before commenting. Yes, it has trouble sweeping in this priority invested metagame, but that doesn't change the fact it can actually sweep. I saw it a couple of the times in the upper ladder (after the Mega Mawile ban for a reason), and it really is a fun and deadly sweeper to build around. For one, most priority users can't do crap to Cloyster. The only notable one that will do severe damage is Mega Scizor because Band is uncommon nowadays. Mega Scizor generally run more defensively oriented spreads and even with an offensive one, it really can't scratch a 180 Base Defense. Breloom ends up being some suicide Spore user that only lives at full health to check BirdSPAM, but other than that, it Spores, does ridiculous damage with Bullet Seed + Rock Tomb and dies. Conkeldurr sucks in this metagame and no one uses it, and it resists Aqua Jet + Ice Shard, Sucker Punch and Brave Bird are the only real ones especially since ESpeed + Quick Attack is not going to kill of even a weakened Cloyster unless Dragonite is Band or you see Lucario. It is still a problem that hurts it viability, but take a comparison versus last generation. One common misunderstanding is that all people who use Cloyster use it incorrectly. It just leads off, sets up Shell Smash and if you do "standard lead with special attacker and make Cloyster noob forfeit lolololol" or you are clumsy and let it Smash and its not OHKOing your whole team. Cloyster became viable after Aegislash left the tier, even more viable when Mega Mawile left where people see Cloyster in the upper ladder. Cloyster is actually a hard 'mon to beat when it sets up really tbh. Not much can outpace Cloyster outside of Sand Rush Excadrill or Swift Swim users. Walling it is your best bet and what walls Cloyster for offensive teams? Keldeo and that takes over half and can be flinched by King's Rock hax sets. Azumarill loses with Rock Blast with prior damage and other bulky waters sit in the same boat outside of Slowbro (trust me Suicune is really really easy to wear down). Ferrothorn takes a crap load and other things lose to Razor Shell. Thundurus-I is a pain in the butt, but it can't switch in outside of Shell Smash, but if I see Thundurus-I, I never set up until it is gone with repeated Pursuit + Stealth Rock support. Finally, Cloyster is a huge threat to stall teams. Please take a look at common stall and find a group of 'mons that aren't 2HKOed. Exactly and non of these mon can do anything bar phaze it or status it bar Clefable (which will result in a 2HKO). Yes, I am making Cloyster look good with these pros, but it has various flaws of being predictable, being easy to pick off with priority by doing sack-setup-damage-priority combo and it can't set up on most 'mons because of its bad special defense along with taking possible massive damage setting up, but if you give it a right amount of support, I honestly feel like it is a better sweeper than Haxorus and Volcarona (please half the common meta can wall this lol), so I propose it should be placed in C- rank despite its bad reputation and that is saying something. I am not overselling it and I have seen some good players use it in the past. It is viable now.