Early thoughts of a new meta, subject to change.
As for the new mons, the most notable are the ones that have been notable in previous generations. We only got one truly new Pokemon, which is
Poltchageist. It doesnt get the move Matcha Gotcha, only it's evolution does. So theres not really a reason to use it (
B-).
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S
If you spend 10 minutes on ladder you will understand why these Pokemon are by far the best in the tier. Mienfoo's Ability let's it come in on most mons and pop back out with U-turn or you can run Scarfed Reckless instead and blow shit up.
Vullaby has insane bulk and any time its hit by a physical move it will probably kill one of your Pokemon. I have run Nasty Plot Vullaby, Iron Defense Nasty Plot Vullaby, Scarfed Physical Vullaby and Pivot Vullaby. All of these versions are insanely strong. Suspect test this Pokemon soon please.
Voltorb-Hisui is still just as good as it was before, getting a Paralysis through Static on whatever Pokemon wants to U-turn you (Usually Vullaby and Mienfoo) is huge if not game winning.
A+ Koffing's ability Neutralizing Gas has so many usecases it's honestly absurd. Whether you want to stop Regenerator Pokemon from healing or Sun/Hail/Rain/Sandstorm Pokemon to lose their Speed boost in their dedicated weather, Koffing can do it all. I myself have been running quite some Scarf Koffing with great success. It threathens Voltorb-H and Mienfoo while also keeping a hold on all the weather sweepers.
A+ Gothita is as hard to pilot as ever, especially now that another strong Dark Type has dropped into the tier. Being able to trap Mienfoo, Glimmet or Timburr can open up other teammates to set up and sweep the game.
A+ Glimmet is able to annoy Pokemon like Mienfoo and (Physical) Vullaby. Both of these Pokemon want to click U-turn whenever they can and punishing that with it's toxic spikes is really nice. Most people are running Koffing as their dedicated Poison type which doesnt threathen Glimmet very much (Fire Blast, Sludge Bomb usually).
A+ Just like Mienfoo and Vullaby, Timburr used to be a good Pokemon in oldgens and the new pool of Pokemon isn't going to show any resistance to it. Whether youre running this as your dedicated Defogger or a Bulk Up variant, it will usually be tanky enough to stay around while hitting hard with Drain Punch to keep it healthy.
A+ Sandshrew-Alola is one of my favorite Pokemon that dropped through the DLC. Ive seen some people question how good it would be, I personally think it easily hits A+ tier if not top of A tier. Loaded Dice Tera Ice Icicle Spear hits everything that isnt a Water type of which there aren't many due to Voltorb-Hisui making their lives miserable. Combined with Icy Rock Snover this Pokemon often sweeps games.
You can also use it outside of Snow, or so I am told. I personally dont really understand why you would choose it over something like Toedscool.
A Corphish is a Water type with Adaptability, which would be great if not for Hisuian-Voltorb. If we ever get around to banning Hisuian-Voltorb, Corphish will become a serious threat. Until then it's down in the A tier which is still good.
A Tinkatink got a lot better with the release of Vullaby and Mienfoo (I also think it got Knock Off through TM's?). A serious lack of answers in the current meta was the perfect opportunity for Tinkatink to show what it's worth. So far it feels pretty good to use, although people are adapting to it by running Tera Ground Vullaby or just Clicking High Jump Kick with Mienfoo.
A Snover got a lot better once Alolan Sandshrew finally dropped. Since Vulpix-Alola was banned on day 1, this was the next best Snow Setter in the tier. It can afford to run Icy Rock while keeping a bunch of Bulk through Snow, gen 9 couldnt have made Snover any better than it is in its current form.
A- Charmander was already a Sun Sweeper before. Before the DLC dropped Sun wasnt very notable, but now that we have Bellsprout there is atleast somewhat of a reason to run Sun. That said Charmander can be stopped by Hazards and Priority rather quickly and wants to run Tera Fire to be able to sweep. The combination of these factors makes it a A- tier mon. An unprepared player can easily get swept by this demon, but any competent player should be able to pilot themselves around this threat.
A- Munchlax is severely underused. Thick Fat gives it a good matchup versus Hail and Sun teams, while it' Special Bulk allows it to tank threaths like Hisuian-Voltorb. My personal favorite set is Tera Fairy Rest-Talk, which can put a stop to Mienfoo, Timburr and Vullaby all of which are pretty high value targets in this meta.
B+ Stunky got access to Defog. That is really the only reason I wanted to mention this Pokemon.
B+ Grookey got access to Grassy Glide, but the move is worse than it was before. Grassy Terrain Wood Hammer remains scary, but it can't click it as freely now that it has to worry about Koffing, Vullaby and Voltorb-Hisui.
B+ If you played LC right before the DLC dropped, you will have seen these two run around. Now that the power balance has shifted, they will probably fall out of favor. Shellder did gain access to Icicle Spear once more, but im afraid it's little too late for it now.
B Bellsprout is the best Chlorophyll Pokemon in the tier. Although that doesn't say much. It's pretty underwhelming still, relying on Tera to do litteraly anything. Just wait for
to drop before investing any stock in the Sun team Structure.
B Sandshrew has access to Sand Rush, but unlike its Alolan counterpart it doesnt really have the typing to do much in the current meta. The best set is probably a Tera Bug, Leech Life, Swords Dance set which is sadly vulnerable to getting Paralyzed by Static which straight up loses you the game. Its too slow to do much besides set up Stealth Rocks and while Rapid Spin is nice, when do you get to click it without being threatened by something afterwards?
B Shell Smash Turtwig is not as scary as I would like it to be. It clicks Shell Smash, gets one kill, and is then taken care of by Mienfoo, Vullaby or Koffing. It does get access to Stealth Rocks, but I havent been able to get it to work.
C Why did they gave Sentret Tidy Up? Such a waste. This Pokemon sucks.
That's it for the Pokemon that I found worth mentioning. For people who hate reading I have included a visual representation of my Viability Rankings. It's hard to rank the Pokemon in B+ and below in order of how good they are as they all fulfill different roles (who can say whether Diglett-Alola or Munchlax is better?) so dont focus too much on the order of rankings inside one tier.
(Make your own Viability Rankings by clicking this link)