Finally Dynamax is banned, we can now play a real tier without a broken and dumb mechanic.. but first let's see which are the winners and losers as a result of this ban !
The losers
Max Airstream abuser of obviously the biggest losers in this story because they can't boost their speed anymore which is annoying because the speed in boost was the main thing which allows them to snowball and to go rampage against opponent's Pokemon/Team. Charizard is particularly affected by this ban since its only viable set depended entirely on the Dynamax mechanic which allows it to setup its own Sun and boost its Speed. This ban also impact Rotom-Fan which was able to use Nasty Plot then Dynamax to use Max Airstream. It's also to a lesser extent a bit annoying for Pokemon like Mew, Intelegon, Diggersby or Sirfetch'd.. which were using Max Airstream to boost their speed. However it was more used for the boost than for some real damages and they're still viable even without Max Airstream.
Choiced locked Pokemon valued the Dynamax mechanic since it allows them to unlock from their Choice item which was really useful if they want to get rid of a special threat or an annoying Pokemon. It also forced some 50/50 when players were in front of Choice locked Pokemon because they had to think about the opportunity of those Pokemon to unlock thanks to Dynamax. As a result, Pokemon like Boltund, Braviary, Gengar, Indeedee or Inteleon kinda regret this ban. Now we don't have to scout anymore, if a Pokemon is locked, it will stayed locked for the rest of match unless you're using Knock Off on it !
Setup Sweepers in general could abuse of the Dynamax because it allows them to hit super hard or setup even more (with either Max Knuckle, Max Ooze or Max Airstream). Pokemon like DD / SD Mew were able to snowball thanks to Max Mindstorm or Max Knuckle. On the other hand Gengar was able to boost its special attack thanks to Max Ooze which was deadly thanks to the gain of bulk provided by Dynamax. There was a plethora of Pokemon which could abuse of this like Shell Smash users such as Barbaracle, Cloyster or Polteageist, Clangerous Soul Kommo-o or No Retreat Falinks. Durant is another Pokemon which was a great user of Dynamax since it allows it to abuse of its ability Hustle without the fear of missing an attack. We can also talk about Weather teams such as Sun teams and Rain teams which may be nerfed by this ban since Dynamax allowed Pokemon to setup the weather but overall I think they're still viable archetypes.
The winners
As I said in a previous post, I strongly believe that Obstagoon is one of the major winner of the Dynamax ban. Dynamax was a mechanic which was able to greatly boost the bulk of its users which allows them to handle way more attacks than in their normal form. As a result, a lot of Pokemon were able to handle Obstagoon's hits thanks to Dynamax and retaliate back which wasn't a good thing at all for Obstagoon since it forces it to take some extra damages. Now than Dynamax is gone, Obstagoon is going to be a great powerhouse able to act as a great Wallbreaker thanks to Guts or Guts + Bulk Up while being able to be a Stallbreaker thanks to Taunt. This Pokemon is going to be great for sure !
Like Obstagoon strong hiters are going to be really good in this new metagame. I can definitively see Nasty Plot or Choice Specs Gengar being really hard to handle since Dynamax is now banned and there isn't anymore Pursuit in the game. The tier doesn't have a lot of Ghost resistances so it's going to be really hard to handle this Pokemon. Even Umbreon will need to be careful because Specs Focus Blast or +2 Focus Blast / Dazzling Gleam are going to do a shit load of damages to it. On the other hand, Frosmoth is a great setup Sweepers thanks to Quiver Dance. Even if it struggles to break Steel-types it's a dangerous sweeper which can tears apart some defensive core with Hippowdon, Umbreon or Weezing-Galar. Also there isn't a lot of great Steel-types in the tier due to / thanks to (pick the one you like the most) dexit. Steelix doesn't like Ice Beam because of its Ground-type while Bronzong doesn't enjoy a boosted Bug Buzz due to its Psychic-type (40-48% at +1). However, Escavalier, Copperajah and Doublade looks good vs the frozen moth. While strong special hitters looks nice, it's also the case of physical powerhouse like Bewear, Diggersby and Sirfetch'd which all like the overall bulk debuff induced by the ban of Dynamax. Since all of them have access to Swords Dance and great STAB, they can all be great vs some defensive staples such as Umbreon, Avalugg or Hippowdon.
Whimsicott enjoys a looooot the ban of Dynamax since it can now freely abuse of its Prankster ability and in particular "Encore" which allows it to bother quite a lot setup Sweepers and defensive foes by locking them in a status move. Because Dynamax was able to bypass mechanic such as "Encore", Whimsicott wasn't able to stop Dynamax set-up Sweeper but now it's not anymore an issue for it ! Since it also has some great move thanks to Tailwind, U-turn, Moonblast or Memento, I can definitively see my fluffy boy become a really nice and useful tool in the tier.
Defensive staples can freely take a breath now that Dynamax is gone. Even if top Ladder players were using (semi-)Stall teams it wasn't always easy for defensive Pokemon to handle all the pressure induced by offensive Dynamax abusers. Most of the time, they have to Dynamax back in order to be able to handle threats like Kommo-o, Gengar or Polteageist. While I don't think that defensive teams are going to be overwhelming at all, I do believe that they're gonna be better and the same goes for Balanced which struggled a lot in the past metagame in my opinion since all the pressure was put on only 2-3 Pokemon and it wasn't always easy for those Pokemon to handle all the different threats linked to Dynamax.
Overall I'm super happy that Dynamax is gone and I do believe that it will be better for the tier. We just need to wait until Showdown works again to see, explore and play a brand new metagame with even more possibilities and even more fun things to use !