I got ninjad by Gary so my points are a bit different, although I'm fine with making the moves mentioned in the new slate there even if I don't agree with M-Venu.
Lando-T is insanely consistent lol, it finds use vs every type of team, and is extremely to difficult to deal with because even if you "counter" it, it's still setting up rocks, dealing rocky helmet chip damage to whatever hit it, and u-turning out to generate momentum (and that's only considering 1 set).
Lando-T is easily the strongest mon in the tier, and that's reflected in its usage.
I mean the fact that lando-T is the most common switch in to itself, and that lando-t's are running HP ice just to target lando and chomp, should be telling about how strong it is lol.
I really feel like this is an exaggeration in regards to Lando-T especially calling it the strongest mon in the tier when it's usage is reflected to p2s point in keeping arguably way more dangerous stuff at bay, and the strongest mon is Clef while some Torn-T, even Weavile, are more offensively constraining on team-building than Lando-T will ever be.
The numerous amounts of counterplay possible to Lando-T on any given team without too much effort is enough to keep it at A+, and that should be the main point when trying to argue its placement. I don't like the perception of justifying usage rate as the indicator of viability with the exception of lower ranked mons, which are more keen on showing an improvement or slightly worse performance over the duration of a meta shift. For the sake of example you have a M-Scizor to S rank club when its WCOP winrate was kind of awful, its ladder presence is a bit more match up based these days, but I don't think anybody would comfortably sit here and say it's not a legitimate threat in need of preparation, accounting other numerous factors for the low W/L.
Putting Lando-T above Torn-T and Latios is a bit chuckle worthy to, at least in my eyes. These two mons put a lot more constraint in the team-builder phase than Lando-T does to me personally. I value viability threads that acknowledge more the threat management side of things than just throwing up glue mons as high as possible and assuming they're super difficult to handle or function in the way people describe. A good example is Heatran, how in theory its this fantastic rocker and provides lots of useful traits, but over the couple of months the Latios have been running more Surf and a telegraphed Heatran switch in can be easy to play on, putting it into 2HKO range or threaten it out with Lopunny, an amazing mon.
I'm gonna go ahead and just add a couple of things I noticed watching OLT and what I've noticed a lot of my building and building from peers have gravitated towards.
A+ > A : This one is a bit questionable, I may not be too sure either, but I feel like M-Diancies presence in the tier is kind of winding down. This is more in line with just dropping stuff that's got worse instead of raising stuff that has gotten better so in tandem with potential raises I guess stuff asked to be raised can possible stay. I haven't seen a single defensive build it can really hurt, lots of the grounds like Excadrill and Lando-T opt for Scarf as legitimate options, same with Latios, and I'm actually a bit worried about running M-Diancie like I was during the ladder phase because of the increase of Rachi among these other points.
A > A+ : More in line with sort of maybe legitimizing the A+ to something more sound. All of Garchomps offensive sets are really good, if there's something that is actually against Lando-T it's the fact Lando-Ts checks sort of maintain consistent through all of its different sets, while Garchomp is a bit different. The only good check to Garchomp from my experience is Clefable and Skarmory, who doesn't like Life Orb boosted EQs or SD sets. SubSalac SD is super strong against your typical Lando-T squads, where Lando-Ts nature of being chipped constantly puts it into range for a sweep. Life Orb same deal but instead provides more immediate power to threaten stuff like Skarmory. Garchomp moving up kind of brings up the point of why I think Diancie has gotten worse, as well as justifying the Char-X move up more.
I touched upon Heatran a bit, but I know that is more of devils advocate opinion than something obvious or something people will agree with so yeah.
A- > B+: I'm putting this here because I think all of the megas in A- right now are more functional than M-Alakazam in the current meta-game (exception M-Latias) but I know it's bad to throw everything up a rank to bloat stuff up. This might seem like weird logic to drop something but every single mega except M-Latias falls under that checklist you use to prep for stuff. M-Pinsirs noticeable presence in exploiting Flying weak squads, M-Metagross which is a beast that becomes more dangerous if you don't know the set right away, and Char-Y is another mon exploiting the Lando-T + Lati teams paired with something that can pick off Lati like pursuit support. I think M-alakazam is in a weird state right now in line with the Rachis, various scarfers, priority from the likes of birdspam, and its hard to justify HP Fire on it to dent M-Scizor a big factor in its lack of effectiveness to me.
A > A+ : This was kind of mentioned awhile back by SJCrew (forgot the name off the top of my head my b) but I think it's time to probably consider this one. I know CBB likes to go "Lol Band Weavile", I do to honestly, on that one stall team but it turns a team that is otherwise horseshit into something that can actually work and holds it together. On the note of anything other than its presence on stall, Life Orb variants, it's up there in terms of teambuilding constraint due to a lack of really good checks to it, which either get flinched or picked off overtime like Keldeo. Pursuit variants encompass that teambuilding support in removing key threats such as weakened torn-T and wall-breakers and it's priority and excellent STAB combo gives the user a lot of leeway into forcing switches in favor of the Weavile user to either double switch on or just spam an attack.
B > B- : The stallbreaker set doesnt stallbreak anymore plain and simple, which is one of the key points I feel why it was ok where it was. The nature of M-Alakazam being a bit worse ties in with regular Alakazam as well. The more imposing presence of stuff like Volcarona and Dnite in B doesn't feel right to say Alakazam is on an equal playing field where their versatility is a bit more effective, while Alakazam is a bit easier to read and play on. Still an offensive powerhouse with its Life Orb set but otherwise getting weaker in the meta.
C > B-: By the virtue of it being used more on Hyper Offensive squads, notably birds, but in general I've seen this a lot more and it's a pretty consistent Rocker even against Lopunny squads when running the usual speed + bulk. This is one of those where usage can kind of relate to viability.
A > A+ : Questionable to, but this has gotten more usage lately and can be the death to a lot of bulky offense squads relying on Latios as its checks I find. Tail Glow is still as good as ever Idk what to say here cause most people know what Manaphy does well. Still a very dangerous mon, a large reason why I hate using Heatran these days is because of this little monster right here.
Edit: Smogon Tour has started up so it's a good time to keep a track of good replays to see what can move up or down to.