Making two nominations:
1) Nominating Cobalion for A- Rank:
Cobalion has quite a few roles on a team, either as a Swords Dance Sweeper, A Stealth Rocker, Taunter, In Volt Turn teams, etc. While you might say base 90 attack is a bit low. It still has a lot of traits. It's typing makes it neutral to Psychic, it has base 129 Defense and base 108 Speed. So it's really fast and it is also pretty Physically Bulky. The reason I think it should be nominated for A- is because it can come in on the likes of Umbreon, Chansey and pretty much set up on their face. I particularily use the Swords Dance+ Lum Berry Combination, it gets stuff like Swagger users like annoying ass Liepard and it also helps vs walls that may try to status me like Chansey (if they carry T-Wave), Porygon2, Florges, etc. With Lum it pretty much negates that and lets me get up another Swords Dance, pretty much if you get up 2 SD's, you're gonna sweep with your Cobalion. I personally consider it a pretty damn good underrated pokemon, and it since it's UU , it's not completely overshadowed by Lucario. It's steel typing allows it to hit common Fairy Types like Florges, Gardevoir, Slurpuff, Granbull , etc.
I'll show you guys a few calcs with Cobalion:
+2 252 Atk Cobalion Close Combat vs. 252 HP / 252+ Def Suicune: 199-235 (49.2 - 58.1%) -- 62.9% chance to 2HKO after Leftovers recovery
+2 252 Atk Cobalion Close Combat vs. 252 HP / 252+ Def Eviolite Chansey: 806-950 (114.4 - 134.9%) -- guaranteed OHKO
+2 252 Atk Cobalion Close Combat vs. 252 HP / 252+ Def Lanturn: 306-360 (67.4 - 79.2%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
Cobalion pretty much leaves a mark on any pokemon after a Swords Dance which that, and it pretty good Physically Defensive prowess made me think to dominate it to A- Rank at least.
2) Nominating Chansey for A- Rank:
This might seem weird, but from my experiences with Chansey, sometimes it completed it's role, but most of the time it ended up being total and complete set up fodder. The other thing thing I don't really like about is that it needs Eviolite to work, otherwise it becomes completely useless. And with Knock Off just about being everywhere, this blob really needs to keep the Eviolite or it will be dead-weight. The other thing I don't really like about it is that it is Normal type. Normal Type is bad for Chansey, because most Fighting type moves are Physical and Chansey has super lackluster defense. It will pretty much get forced out and you will grant your opponent a free oportunity to set up like a Swords Dance, A Sub, or a set up move. And also there are a lot of fighting type Pokemon in UU, it kind of makes me avoid using it. Heracross, Mienshao, Hawlucha are all really common and they just shit on Chansey. Also if Chansey comes against a Ghost , it can't do anything about it as it only gets Seismic Toss as it's only attacking move. So that's why I think it should go A-. It's not bad, but it has those issues which keep it from being as effective as it used to be. Chansey would also appreciate Lefties recovery, which it can't get because it is forced to run Eviolite, pretty much.
I pretty much agree with what you said about Cobalion. What I want to add is how it fucks with usual checks to SD fighting types. Its Steel STAB allows it to easily beat Florges and Granbull, the go to fighting counters after Knock Off buff. With lum berry attached, Cofagrigus, Mew and Rotom-N all fail to burn it and are 2HKOed in return. Crobat can't do much to it thanks to its seconary steel tying and great bulk. While it is somewhat weak to comnob regenge killers (Victini, Mienshao, Krookodile), it can really shine against slower teams
. A- Rank seems good for it.
However, I really disagree with you on Chansey. In fact, I think it shold rise a rank to
A+ as the single best mixed wall bar none.
On Knock Off, there is actually only one common Knock Off user named Empoleon that Chansey is supposed of walling (Chansey is not completely safe from Tornadus-T anyway). Knock Off or not, Chansey is never taking on Crawdaunt or Mienshao or Mega Absol, or else it will be broken even in Ubers lol. In reality, a good stall team wil always have something to take Knock Offs (Mega Aggron, Blastoise etc). Even if its Eviolite is Knocked Off, it is NOT deadweight at all. It can no longer wall physical attackers but its special bulk is just less than Blissey for a tiny bit.
252 SpA Choice Specs Hydreigon Draco Meteor vs. 252 HP / 4 SpD Chansey: 297-349 (42.1 - 49.5%) -- guaranteed 3HKO
252+ SpA Mega Launcher Mega Blastoise Aura Sphere vs. 252 HP / 4 SpD Chansey: 282-334 (40 - 47.4%) -- guaranteed 3HKO
252+ SpA Choice Specs Chandelure Fire Blast vs. 252 HP / 4 SpD Chansey: 306-361 (43.4 - 51.2%) -- 5.9% chance to 2HKO
252 SpA Life Orb Sheer Force Nidoking Focus Blast vs. 252 HP / 4 SpD Chansey: 317-374 (45 - 53.1%) -- 30.5% chance to 2HKO
Even the strongest special attackers can't manage to 2HKO itemless Chansey.
252 SpA Life Orb Latias Psyshock vs. 252 HP / 252+ Def Chansey: 300-355 (42.6 - 50.4%) -- 1.2% chance to 2HKO
252 Atk Jirachi Iron Head vs. 252 HP / 252+ Def Chansey: 216-255 (30.6 - 36.2%) -- 52.7% chance to 3HKO
252 Atk Krookodile Earthquake vs. 252 HP / 252+ Def Chansey: 301-355 (42.7 - 50.4%) -- 1.2% chance to 2HKO
It can still take relatively powerful physical hits as well.
Being a nornal type is not anything bad for something as bulky as Chansey. It never needs resistance to wall virtually every special attacker and many physical attackers reliably. Having only a single weakness is great, even better when fighting is primirily a physical attacking type, making it really hard to break on the special bulk (only NP Togetic breaks it lol). While Fighting types are buffed with Knock Off, they are actually less common than last gen and fighting resists like Cofagrigus, Granbull, Florges, Slowbro all pairs well with Chansey. I personally use physically defensive Doublade with Rest, which walls every fighting type INCLUDING Scrafty to hell and back even with Knock Off with 252+ Knock Off deals 36% max. Chansey really doesn't need much support and the support needed is usually essential for stall already.
Lacking leftovers is quite bad, but its bulk more than compensates for it. Lacking leftovers never stopped Mega Venusaur from being S Rank in UU. Chansey is even harder to wear down thanks to much more reliable recovery and pseudo immunity to status. Lacking leftovers is more or less compensated by its great bulk.
Chansey's assess to Softboiled is also a perk. Unlike Vaporeon and Florges, Chansey is not forced to stay in for 2 turns in order to recover health, potentially giving many sweepees easy set up. With Wish + Softboiled, it can pass huge wishes to teamates while immediately recovering health.
Another thing is that its Wish and cleric support is appreciated by many pokemon that cover up its weakness. Mega Aggron, Doublade, Mega Blastoise are all excellent pokenons that cover up Chansey well but have no recovery and are prone to status. Chansey doesn't really need to be supported specifically. In return, it provides invaluable support to a team to a point that even bulkier offensive teams can possibly fit in it. It is deserving of A- Rank.
JUST DROP CHESNAUGHT ANYWAY