Been playing this meta a bunch for the last couple days, and having now hit #1 on ladder with a variety of teams, I'd like to share some thoughts about the current state of affairs.
: Much like Heat Rock, I think this thing undisputedly deserves a ban. NU contains a plethora of viable sweepers in Ludicolo, Qwilfish, Belly Drum Poliwrath, Golduck, Gorebyss, Relicanth, and many more. Volbeat remains the most consistent setter of Rain, throwing out Encores and T-Waves while threatening to generate momentum with slow U-Turns. Aerodactyl also serves as a solid lead, with Taunt/SR/Rain and a very hard-to-beat speed tier. While the playstyle does have it's flaws, a lack of overwhelmingly goodwater-resists (paired with the great secondary STAB options of Ludicolo / Qwilfish / Poliwrath) makes me feel like Rain is quite over-tuned at the moment. I feel like each of the few times I queued with Rain, pure water-spam was enough to overwhelm most teams.
: Probably the three best mons in the tier that aren't overwhelming/potentially broken. They are very, very consistent in their roles, and most teams just feel better when you have one of them present. I think what makes these three especially annoying is their ability to never feel truly "safe" to switch into, as you always have to fear a potential incoming T-Wave from Regi or Toxic from Skuntank, while Sandslash often just gets free rocks on switch. Probably the most reliable Hazard Setter and Hazard Removers in the tier, respectively. When the meta slows down a bit more and some of the broken offensive threats get banned or adapted around, these three could very well be the three best and most reliable mons in the tier.
: Not hard to see why Sceptile is dominating the early meta - very good speed tier, hard hitting STAB in Leaf Storm, pseudo-recovery and reliable damage output in Giga Drain, and serviceable coverage options in Focus Blast and Dragon Pulse. I think that the most overlooked set that will gain traction is Mixed LO with Earthquake, as many teams are currently crutching on SpDef Skuntank to constantly switch into Sceptile. Both its speed tier and its raw power are shaping the meta around handling it either offensively or defensively (and doing either is a very tall task). Many teams are even starting to resort to less-than-stellar mons in Meganium and Bellossom simply to answer Sceptile. One of the most restrictive mons in TeamBuilder, imo.
: Despite being probably the most one-dimensional mon in the tier, Typholosion still feels very, very strong in this meta. Reliable fire-resists are hard to come by, and the most premium and prominent example in Lanturn finds itself getting chipped down throughout games due to a lack of recovery options. In many games, Scarf Typhlosion ends up getting enough chip damage on its switchins to wreak havoc in late-game scenarios, or just punch absurd holes in teams when running Specs. It also has the Galarian Darmanitan effect, where the prominence and possibility of Scarf makes you fear that speed-tier, but the possibility of Specs changes the way you play around it until you've scouted which one it is. Not sure if Typhlosion is broken due to its one-dimensionality, but it is certainly shaping the meta in a similar way to Sceptile, as teams are starting to run Flash Fire Flareon/Ninetales, or even Corsola to consistently answer Typhlosion. Not as restrictive in TeamBuilder as Sceptile, but similar to me.
: Quite possibly the most under-represented mon on ladder right now, Tauros is a complete menace. While it suffers from slight 4MSS, the lack of switch-ins across the tier and its very solid speed-tier make it a nuisance to handle. Normal resists in general are pretty hard to come by, and the few that are easily fit onto teams take decent damage from Earthquake on the switch. Tauros sometimes struggles against offense, because its speed-tier isn't quite as strong as Sceptile's, but it wreaks havoc vs. Bulky Offense/Balance teams.
: On paper, Electivire seems lacking - its speed-tier is solid, but not in the same atmosphere as Sceptile/Tauros/Dodrio. Similarly, Electivire doesn't have the best natural bulk, and it suffers from 4MSS. In practice, however, I find that this thing just shits all over Balance and Bulky Offense. EQ/Wild Charge/Ice Punch is all the coverage this thing needs, and Volt Switch allows it to easily get chip damage on a switch-in (like Regirock, for example), and then pivot out. EQ hits Skuntank and Lanturn, two of the most popular and reliable pokemon in the tier currently. Electivire just strangely never looks absurdly good in TeamBuilder, but always ends up with solid matchups in practice. Definitely a strong pokemon, but not overwhelming by any means.
And for some other things that I think are really strong and underrated right now, but don't warrant long-form discussion:
: Adamant Ninjask still out-speeds the entire un-boosted tier bar Timid Electrode, and Banded U-Turn hits really hard. Nabs an absurd amount of free momentum while dealing very respectable damage. Infiltrator to handle Subs and hit through Veil is really nice as well.
: Very, very underrated. Base 110 Speed + Sleep Powder makes this thing always annoying to switch into, and Seed Bomb/Acrobatics covers most of the tier. Sleep Powder + SD + 110 Speed makes this thing a nuisance of a late-game cleaner. Also, Infiltrator is great in the current meta, just like on Ninjask!
: One of my favorite Scarfers at the moment. Outspeeds the entire un-boosted tier (bar Jolly Ninjask and Timid Electrode) with Scarf, Fire/Fighting is really solid coverage, and free U-Turns always feel great. Priority is also really hard to come by in this tier, and Mach Punch functions nicely as a fail-safe in many scenarios.
: There are not many good ice-resists currently, and many that do exist get hit hard by Freeze-Dry. While its speed-tier holds it back significantly, Specs Glaceon is probably the single hardest thing to switch into in the entire tier.
: With the prominence of entry hazards in the current meta thanks to things like Qwilfish and Regirock being so consistent, Kangaspikes resurfaces as one of the most tried-and-true playstyles out there. Not surprising to see this thing succeeding on ladder, but an interesting meta trend regardless, and one that I think will grow in popularity as time goes on.
Thanks for reading!