There is a pretty decent set I've made use of lately mainly due to the fact I can't seem to pull off subseed and subpunching is just too situational for me.
Breloom (M) @ Toxic Orb
Trait: Poison Heal
EVs: 252 HP / 128 Atk / 128 Def
Adamant Nature (+Atk, -SAtk)
- Spore
- Mach Punch
- Drain Punch
- Seed Bomb
The EVs were set mainly to answer Doryuuzu, as in good health, nothing from Doryuuzu OHKOs even at +2 except for maybe Return. Spore for putting stuff to sleep, Mach Punch for priority, Drain Punch is the crux of this set, letting you take a hit from Doryuuzu and buddies, and heal it off while killing them. If they live, just Mach Punch and finish up, grabbing 12.5% healing along the way if sandstorm is not active. Seed Bomb is, well, coverage and STAB, not much else to say. If nothing else, I'm open to tweaks to the set.