Yo, writing a post after the kickoff tour and some laddering. Meta's very, very, very focused on Balance vs. Balance matchups, with a bit of Rain, HO, and stall thrown in, and as such, gearing your team to win the long game vs opposing balance and stall is imo the strongest way to play. Gonna lay out a few sets that I feel help in that arena.
Toxtricity @ Silk Scarf
Ability: Punk Rock
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Boomburst
- Sludge Bomb
- Overdrive
- Taunt
This is a mild variation on standard Toxt, but running Taunt last really helps you win vs a lot of fatter builds. Byleth's stall has a noted advantage against it thanks to Palos being immune to your strongest moves, but vs most other fatter builds, being able to Taunt their spdef wall will very often lead to getting a mon, and thus making the game substantially easier to play. Sludge Bomb + Taunt also makes you relatively solid into CM clef, which is sorta nuts.
Noivern @ Heavy-Duty Boots
Ability: Infiltrator
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Hurricane
- Flamethrower
- Taunt
- Roost
Speaking of Taunt, builds that spam Taunt are some of my favorites atm. Taunt 2 Attacks Noivern definitely can struggle to make as much progress as it wants, but its a very solid mon atm. Removing the ability for mons like SpDef Corv, Clefable (to a lower extent), Umbreon to check it in the long term is pretty huge, and really ups your offensive potential.
Salazzle (F) @ Heavy-Duty Boots
Ability: Corrosion
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot / Knock Off
- Toxic
- Flamethrower
- Sludge Wave
Honest this is just a good mon. Corrosion Toxic is insanely strong in a meta that's as fat as this one, and NP + dual STABs is surprisingly hard to wall, with the only common resists being TTar (no recovery), Garchomp (no recovery), and Toxapex (often drops Scald), letting you fairly efficiently break a lot of teams over the long game. Toxic is also great team support for a ton of other mons, eg Noivern being able to fairly easily break the aforementioned TTar and Toxapex, and Heliolisk loving Ground-types/Tar being put on a timer. Groudon support is great here btw, giving your Fire-type move insane power at +0 lets you change how you play with the mon.
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Wish support is also great atm.
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Wish
- Teleport
- Protect
- Moonblast
Everyone knows this set, but Wish TP clef gives you a huge advantage over Toxapex, Umbreon, and other fairly passive mons. Every single time Pex comes in, you can use TP to instantly bring in a Lazzle/Toxt and threaten damage against their team. EVs can go either way, but I'm using SpDef here just cause the team I was using it on wanted a strong Noivern check.
Umbreon @ Heavy-Duty Boots
Ability: Synchronize
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Foul Play
- Wish
- Protect
- Heal Bell / Toxic
This is another mon that is fairly strong overall. I think most people are pretty familiar with what it does, but being able to provide very sturdy Cleric support and also check a wide variety of mons in the meta is really strong. You're a fairly good bulwark into Garchomp, Noivern, and Polteageist, and the inclusion of a cleric like this can really help to win in a fat vs fat matchup, cause your breakers will inherently have more longevity than theirs. Pair this with Golisopod btw.
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To get away from fat for a second, I've seen a ton of very strong
Bisharp based Bulky Offenses, which basically just stack high attack mons and abuse the relatively lacking Dark-resists in the meta atm with an insanely high BP Beat Up. I think rarre was using a SD Beat Up Bisharp build, which really can just KO stuff it has no right to.
I've also seen a ton of builds abusing
Magneton to remove Corv (arguably top 1 in the meta, also use Shed Shell, its great) and then force a win vs a lot of Balance builds using Garchomp.
Togekiss is another mon I wanna highlight but don't wanna put an entire section on. Serene Grace Air Slash is sorta insane, and its natural resists and bulk make it really easy to fit on a ton of teams. Mon also has a ton of set diversity, providing optional cleric support, being able to tech to hit just about anything in the meta, and can even be a solid scarfer (arguably best set).
Dragalge,
Necro-DM,
Kyu-W,
Eternatus are all mons that probably need more experimentation.