Alright, I've got some new additions to the initial sets I posted, a lot of which are significantly better. Some are pretty simple, but nonetheless I've found them quite worthwhile.
BuzzSwole:

Buzzwole @ Life Orb
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- No Retreat
- Drain Punch
- Storm Throw
- Leech Life
Buzzwole is by far one of the strongest Pokemon right now in STABmons, thanks in part to No Retreat giving it a very appreciable +1 to each of it's core stats, allowing it to out-speed almost everything and take hits well. Drain Punch & Leech Life give it the survivability it needs for foes it can't OHKO, and Storm Throw gets past setup walls such as Cotton Guard Ferrothorn.
Incineroar:

Incineroar @ Heavy-Duty Boots
Ability: Intimidate
EVs: 252 HP / 176 Def / 80 SpD
Impish Nature
- Sacred Fire
- Obstruct
- Parting Shot
- Darkest Lariat
Incineroar makes good use of it's typing and natural bulk that's backed up by by Intimidate. With access to Dark and Fire moves, it gains Sacred Fire and Obstruct. SF allows for high burn potential with some damage output, and Obstruct can be great to compensate for a lack of strong physical attack.
Fastest Web in the West:

Accelgor @ Focus Sash
Ability: Unburden
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sticky Web
- Acid Spray
- Encore
- Bug Buzz
Fairly basic Accelgor set, but now with Sticky Web access. Encore allows it to pester hazard setters and setups. Acid Spray gives it some potential to cause damage with Bug Buzz. Other than that, nothing too special. Just beats out some of the slower web setters. Optionally, Toxic Spikes + Yawn can be run over Acid Spray + Encore, to put additional pressure.
Thundurus:

Thundurus-Therian (M) @ Life Orb
Ability: Volt Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Thunderbolt
- Aeroblast
- Grass Knot
Thundurus doesn't get much to help it out in here, but it does get one key thing it lacked before: STAB Flying moves. While it has access to the much more powerful Hurricane, Aeroblast is significantly more reliable on this glass cannon. With Nasty Plot, it can OHKO most of the meta, and even breaks past special walls like Blissey. It also greatly appreciates Sticky Web being active to keep fast checks to it in line.
Diggersby:

Diggersby @ Soft Sand
Ability: Huge Power
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Rapid Spin
- Earthquake
- Facade
While Diggersby unfortunately doesn't get access to Thousand Arrows, Extreme Speed, or Precipice Blades, it does gain access to the very useful Rapid Spin. With Rapid Spin now giving speed (and even having a more respectable 50BP), it allows Diggersby to both clear hazards, and get a useful speed boost for potential sweeps. Rapid Spin itself hits fairly hard on Diggersby with his enormous attack and STAB, and can often get a KO on a weaker Pokemon as well. Coupled with Swords Dance for boosting, and it hits like a very fast truck. Soft Sand is used since the usual Stealth Rocks don't really cause a problem for Diggersby (no need for Heavy Duty Boots), and it appreciates the extra 20 base power to help with some KOs that it might otherwise miss out on. Facade is a backup that punishes toxic or burn users, and gives it a workaround for flying types.
BuzzSwole:

Buzzwole @ Life Orb
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- No Retreat
- Drain Punch
- Storm Throw
- Leech Life
Buzzwole is by far one of the strongest Pokemon right now in STABmons, thanks in part to No Retreat giving it a very appreciable +1 to each of it's core stats, allowing it to out-speed almost everything and take hits well. Drain Punch & Leech Life give it the survivability it needs for foes it can't OHKO, and Storm Throw gets past setup walls such as Cotton Guard Ferrothorn.
Incineroar:

Incineroar @ Heavy-Duty Boots
Ability: Intimidate
EVs: 252 HP / 176 Def / 80 SpD
Impish Nature
- Sacred Fire
- Obstruct
- Parting Shot
- Darkest Lariat
Incineroar makes good use of it's typing and natural bulk that's backed up by by Intimidate. With access to Dark and Fire moves, it gains Sacred Fire and Obstruct. SF allows for high burn potential with some damage output, and Obstruct can be great to compensate for a lack of strong physical attack.
Fastest Web in the West:

Accelgor @ Focus Sash
Ability: Unburden
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sticky Web
- Acid Spray
- Encore
- Bug Buzz
Fairly basic Accelgor set, but now with Sticky Web access. Encore allows it to pester hazard setters and setups. Acid Spray gives it some potential to cause damage with Bug Buzz. Other than that, nothing too special. Just beats out some of the slower web setters. Optionally, Toxic Spikes + Yawn can be run over Acid Spray + Encore, to put additional pressure.
Thundurus:

Thundurus-Therian (M) @ Life Orb
Ability: Volt Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Thunderbolt
- Aeroblast
- Grass Knot
Thundurus doesn't get much to help it out in here, but it does get one key thing it lacked before: STAB Flying moves. While it has access to the much more powerful Hurricane, Aeroblast is significantly more reliable on this glass cannon. With Nasty Plot, it can OHKO most of the meta, and even breaks past special walls like Blissey. It also greatly appreciates Sticky Web being active to keep fast checks to it in line.
Diggersby:

Diggersby @ Soft Sand
Ability: Huge Power
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Rapid Spin
- Earthquake
- Facade
While Diggersby unfortunately doesn't get access to Thousand Arrows, Extreme Speed, or Precipice Blades, it does gain access to the very useful Rapid Spin. With Rapid Spin now giving speed (and even having a more respectable 50BP), it allows Diggersby to both clear hazards, and get a useful speed boost for potential sweeps. Rapid Spin itself hits fairly hard on Diggersby with his enormous attack and STAB, and can often get a KO on a weaker Pokemon as well. Coupled with Swords Dance for boosting, and it hits like a very fast truck. Soft Sand is used since the usual Stealth Rocks don't really cause a problem for Diggersby (no need for Heavy Duty Boots), and it appreciates the extra 20 base power to help with some KOs that it might otherwise miss out on. Facade is a backup that punishes toxic or burn users, and gives it a workaround for flying types.