Gonna give my 2 cents on some of the higher ranking nominations.
Landorus-T A+ -> S [no]
I don't really agree with this, though I debated it with myself and others for a while. It's true that viability shouldn't only be determined by how a pokemon acts as a teambuilding constraint, but how they alleviate them as well, which Landorus-T does a good job of. That said, there are two things that I think prevent it from being S rank. The first is that while it's a versatile pokemon, as a defensive pokemon it really doesn't preserve the role compression of say, Clefable. Clefable's best set walls a bunch of things, supports the team with paralysis, and can set up for a sweep late game. While Landorus-T is capable of setting up Stealth Rock, checking big threats in Excadrill and Charizard X, as well as providing U-turn support, these are all characteristics of its defensive set only. Arguments have made that Lando-T can be a revenge killer or late game sweeper, and while this is true, not a single one of these sets is really an "oh damn I gotta deal with this thing" when you see it in team preview. Basically all of its sets are A+ rank at best and arguing that it should move up to S on versatility sort of ignores that the best versatility is the kind that comes from singular sets less than the ability to run multiple sets. The other factor to me is that teams tend to be so ridiculously prepared for Lando-T - even if it is able to do some work it's still heavily pressured a lot of the time and doesn't turn the tables with pressure of its own very often.
Weavile A+ -> A [yes]
I think out of the main Dark-types in the tier right now - Bisharp, Mega Sableye, Tyranitar, Hoopa-U and Weavile - Weavile is the least viable of the bunch. Don't get me wrong, it's still a very good pokemon and a pretty strong restriction on teambuilding, but it simply isn't as consistent or threatening as the others. Sableye and Tyranitar are retardedly consistent and by far the best at providing the support that they do. Bisharp is still a ridiculous pokemon and capable of sweeping a ton of teams after a Swords Dance, synergizes amazingly with hazards and has a decent defensive typing to help it out. Hoopa is just.. man. You don't even prepare for this in the teambuilder really just because there isn't much of a point. If you're building offense you'll have your checks to it and if you are running bulkier teams you're probably gonna have problems. Arguments that its bad against offense aren't entirely untrue but it's still impossible to switch into and can get a kill any given match. Weavile's known for its matchup against offense, and on paper it is still really good. But Weavile is worn down so quickly by Life Orb + hazards and it's really susceptible to other priority users since Ice Shard isn't that strong when it's not a super effective hit.
The other thing is that its checks in Keldeo, Azumarill, Clefable, Klefki, and Mega Scizor (among a few others) are all extremely common. "But bludz, Tyranitar, Sableye and Bisharp checks are extremely common too!" That's true, but the difference is that Sableye and Tyranitar checks do not stop them from doing their job. Having a Keldeo on your team doesn't prevent Tyranitar from pursuit trapping stuff, and having Clefable on your team doesn't mean Sableye isn't cockblocking Ferrothorn for days. The point applies to Bisharp somewhat but most of its checks can be overwhelmed without too much hassle - Keldeo drops to a +2 Sucker Punch from standard LO variants after taking a Knock Off and a few SR switch-ins. On the other hand, these checks do prevent Weavile from sweeping. So yeah main point here is that Weavile actually looks like more of a threat than it ends up being a lot of the time. Still a good mon, but I think A rank is more appropriate.
On the note of some things that I said...
Tyranitar A -> A+
Um yeah so Sand is ridiculous and Tyranitar is easily the better setter. It's the best Pursuit trapper in the tier and it checks plenty of relevant things like Talonflame, Charizard X, and Mega Manectric. Chople Berry sets which have risen a lot in popularity give Tyranitar the role compression that warrants a rise. It sets up Stealth Rock, and also checks a lot of really big threats in 1v1 scenarios. The list includes Mega (and non-Mega) Alakazam, Mega Charizard Y, Hoopa-U, Tornadus-T, Weavile, Thundurus, Mega Pinsir, and more. Being able to actually have a 50/50 Pursuit vs Stone Edge scenario against stuff like Mega Zam, Zard Y, and Torn-T for sand teams is really huge - and the Ttar user is on the better side of these 50/50 scenarios. Scarf is still good too but yeah I think it's mostly the support set that's pushing it up for me right now.
Oh I also agree with Chansey to B+, but I don't think it should go any higher than that.
Landorus-T A+ -> S [no]
I don't really agree with this, though I debated it with myself and others for a while. It's true that viability shouldn't only be determined by how a pokemon acts as a teambuilding constraint, but how they alleviate them as well, which Landorus-T does a good job of. That said, there are two things that I think prevent it from being S rank. The first is that while it's a versatile pokemon, as a defensive pokemon it really doesn't preserve the role compression of say, Clefable. Clefable's best set walls a bunch of things, supports the team with paralysis, and can set up for a sweep late game. While Landorus-T is capable of setting up Stealth Rock, checking big threats in Excadrill and Charizard X, as well as providing U-turn support, these are all characteristics of its defensive set only. Arguments have made that Lando-T can be a revenge killer or late game sweeper, and while this is true, not a single one of these sets is really an "oh damn I gotta deal with this thing" when you see it in team preview. Basically all of its sets are A+ rank at best and arguing that it should move up to S on versatility sort of ignores that the best versatility is the kind that comes from singular sets less than the ability to run multiple sets. The other factor to me is that teams tend to be so ridiculously prepared for Lando-T - even if it is able to do some work it's still heavily pressured a lot of the time and doesn't turn the tables with pressure of its own very often.
Weavile A+ -> A [yes]
I think out of the main Dark-types in the tier right now - Bisharp, Mega Sableye, Tyranitar, Hoopa-U and Weavile - Weavile is the least viable of the bunch. Don't get me wrong, it's still a very good pokemon and a pretty strong restriction on teambuilding, but it simply isn't as consistent or threatening as the others. Sableye and Tyranitar are retardedly consistent and by far the best at providing the support that they do. Bisharp is still a ridiculous pokemon and capable of sweeping a ton of teams after a Swords Dance, synergizes amazingly with hazards and has a decent defensive typing to help it out. Hoopa is just.. man. You don't even prepare for this in the teambuilder really just because there isn't much of a point. If you're building offense you'll have your checks to it and if you are running bulkier teams you're probably gonna have problems. Arguments that its bad against offense aren't entirely untrue but it's still impossible to switch into and can get a kill any given match. Weavile's known for its matchup against offense, and on paper it is still really good. But Weavile is worn down so quickly by Life Orb + hazards and it's really susceptible to other priority users since Ice Shard isn't that strong when it's not a super effective hit.
The other thing is that its checks in Keldeo, Azumarill, Clefable, Klefki, and Mega Scizor (among a few others) are all extremely common. "But bludz, Tyranitar, Sableye and Bisharp checks are extremely common too!" That's true, but the difference is that Sableye and Tyranitar checks do not stop them from doing their job. Having a Keldeo on your team doesn't prevent Tyranitar from pursuit trapping stuff, and having Clefable on your team doesn't mean Sableye isn't cockblocking Ferrothorn for days. The point applies to Bisharp somewhat but most of its checks can be overwhelmed without too much hassle - Keldeo drops to a +2 Sucker Punch from standard LO variants after taking a Knock Off and a few SR switch-ins. On the other hand, these checks do prevent Weavile from sweeping. So yeah main point here is that Weavile actually looks like more of a threat than it ends up being a lot of the time. Still a good mon, but I think A rank is more appropriate.
On the note of some things that I said...
Tyranitar A -> A+
Um yeah so Sand is ridiculous and Tyranitar is easily the better setter. It's the best Pursuit trapper in the tier and it checks plenty of relevant things like Talonflame, Charizard X, and Mega Manectric. Chople Berry sets which have risen a lot in popularity give Tyranitar the role compression that warrants a rise. It sets up Stealth Rock, and also checks a lot of really big threats in 1v1 scenarios. The list includes Mega (and non-Mega) Alakazam, Mega Charizard Y, Hoopa-U, Tornadus-T, Weavile, Thundurus, Mega Pinsir, and more. Being able to actually have a 50/50 Pursuit vs Stone Edge scenario against stuff like Mega Zam, Zard Y, and Torn-T for sand teams is really huge - and the Ttar user is on the better side of these 50/50 scenarios. Scarf is still good too but yeah I think it's mostly the support set that's pushing it up for me right now.
Oh I also agree with Chansey to B+, but I don't think it should go any higher than that.