Focus Sash Breloom is seriously underrated right now. It seems like a lot of people have written Breloom off after the nerfs, but it's still an incredibly annoying Pokemon to face. It's an amazing lead and can often get you a fast start, thanks to Bullet Seed destroying opposing sash leads, and Spore shutting down most targets it can't KO (most notably Aegis). Rock Tomb is great on predicted switches to Mandibuzz or things like Lati@s, allowing you to get the jump on them and 2HKO with a bit of prior damage.
I've also seen a fair number of Poison Heal SubPunch Brelooms, but that set just doesn't seem effective in this fast-paced meta. Has anyone actually had any success with it?
Not really, but I had success with a new gimmick.
Fling, with Dread Plate, I ran Fling / SD / Spore / Mach Punch
+2 252 Atk Dread Plate Breloom Fling (90 BP) vs. 252 HP / 0 Def Aegislash-Shield: 330-390 (101.8 - 120.3%) -- guaranteed OHKO (Jolly)
+2 252 Atk Dread Plate Breloom Fling (90 BP) vs. 220 HP / 0 Def Celebi: 472-556 (119.1 - 140.4%) -- guaranteed OHKO (Jolly)
252+ Atk Dread Plate Breloom Fling (90 BP) vs. 252 HP / 0 Def Trevenant: 326-384 (87.1 - 102.6%) -- 18.8% chance to OHKO (Adamant)
+2 252+ Atk Dread Plate Breloom Fling (90 BP) vs. 252 HP / 252+ Def Gourgeist-Super: 324-382 (86.6 - 102.1%) -- 18.8% chance to OHKO (Adamant)
These are the pokemons that walled my Breloom so badly, and Breloom almost always baits them in
As for Latios and Latias, you have to predict them on the switch.
+2 252 Atk Dread Plate Breloom Fling (90 BP) vs. 4 HP / 0 Def Latias: 514-606 (170.1 - 200.6%) -- guaranteed OHKO
+2 252 Atk Dread Plate Breloom Fling (90 BP) vs. 4 HP / 0 Def Latios: 566-668 (187.4 - 221.1%) -- guaranteed OHKO
It actually worked out pretty well, and good old SD + Mach Punch is still good too.
As for the sash set, it basically checks every sweeper.
For example, Landorus uses Psychic and you use Rock Tomb, then you outspeed and use Bullet Seed.
Or he uses Psychic, you use Spore, he switches, you use Rock Tomb, and then KO the thing that he threw in.