So I got a 50 streak in super Singles and recently got a 50 streak in Super Doubles, having a lot more fun with Battle Tree than I did with Maison (even though I had enough patience to get all 5 trophies in two games). Had a good time running this for singles:
Salamence-Mega @ Salamencite
Ability: Aerilate
Level: 50
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Double-Edge
- Earthquake
- Dragon Dance
- Roost
Pretty simple stuff, Salamence kills stuff but with the Aerilate nerf I don't trust anything other than Adamant Double-Edge. I initially ran Return but my hesitation with it cost me my first streak in the late 30s when I switched out and got Celesteela frozen by Ice Beam, so I've just gone all-in with Double-Edge since. Recoil sucks but when I'm killing stuff that's fine. Intimidate also makes it a great lead etc
Celesteela @ Leftovers
Ability: Beast Boost
Level: 50
EVs: 252 HP / 44 Def / 200 SpD / 12 Spe
Impish Nature
- Heavy Slam
- Leech Seed
- Substitute
- Protect
A SubSeeder seems slow and inefficient for Battle Tree but it was reliable and got me out of a ton of sketchy situations, Celesteela is just that good at this. I'll usually be switching into special moves so the special bulk made more sense, though I initially had meant to run roughly even bulk and apparently messed that up by accident. It's just a reliable mon to switch into most of the time when Salamence goes down or I don't trust it to be able to set up or OHKO something.
Marowak-Alola @ Thick Club
Ability: Lightning Rod
Level: 50
EVs: 252 HP / 252 Atk / 4 Spe
Adamant Nature
- Flare Blitz
- Shadow Bone
- Bonemerang
- Stone Edge
This thing actually sucks lol it doesn't even check Ice or Electric types since they all have Shadow Ball/Dark Pulse. When it worked it worked well but there were too many fights where I switched Salamence out in front of the oddly bulky Glalies only to get hit by a Dark Pulse/Shadow Ball and died the next turn. Still, it was better than not having an Electric switch-in so I have to give it credit there. I'm definitely switching this out when I continue later though. I'll probably run something like Salamence/Scarf Tapu Lele/Aegislash or AV Magnezone continuing onwards though.
For Doubles I had an easier time though I didn't run a Mega there, opting for Garchomp instead and adding my Hyper Trained Scarf Tapu Lele as a cleaner. Celesteela + Marowak lead was pretty solid since Marowak had a teammate helping it out, though I ran into a ton of Fire-heavy teams later which was very bad since they would inevitably have a Dark or Ghost move (lots of Intimidate Incineroar). Usually I could find a way to win with just these two and only need to bring in one of Garchomp or Tapu Lele to clean up, both were great cleaners thanks to their speed.
Garchomp @ Groundium Z
Ability: Rough Skin
Level: 50
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Dragon Claw
- Poison Jab
- Protect
Groundium Z is stupid strong and makes it much easier to use a Ground move without needing to protect my teammate, otherwise the set is pretty straight forward. Dragon Claw isn't overly strong but Garchomp usually only ever needed to clean late-game so that was fine, while Poison Jab was good for Fairies. Since Marowak dies first most of the time this pairs well with Celesteela, functions similarly to how it does in VGC so it works pretty well.
Tapu Lele @ Choice Scarf
Ability: Psychic Surge
Level: 50
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Psychic
- Moonblast
- Thunderbolt
- Dazzling Gleam
Tapu Lele is broken, not much else to say here. Psychic destroys and it's the move I used 90% of the time this thing came in. Dazzling Gleam came in handy a few times and honestly the rest doesn't matter usually.
Will probably continue Singles to see if I can scout a solid Anabel teammate to use for Multi, anything with non-Mega Latios would be excellent. Otherwise I got Aether Foundation Luke with Mega Metagross and a Tailwind Toucannon which sounds like a solid teammate.