One of my Favorites! Although not top in the chart...
First time posting a moveset, I'll try my best tho.
Agressive Suicide Physical Sweeper
Kommo-cidal (Kommo-o) (M) @ Life Orb
Ability: Bulletproof / Overcoat
EVs: 252 Atk / 252 Spe / 4 Def
Adamant Nature
- Swords Dance
- Outrage
- Reversal
- Earthquake / Rock Slide
This set focuses on going in, taking 1-3 enemies and then retiring. The reason why I maximized Atk and Spe is because you obviously want to act first, take advantage of the solid Atk Stat he has, buff it up with a single Swords Dance and then select a Outrage for a STAB, Reversal for STAB when low HP and Earthquake for covering Electric types or Rock Slide for Flying, although he shouldn't have much problem at KO'ing anything after he gets one Swords Dance out as his damage skyrockets. Bulletproof is to protect him from some moves that could cause trouble, Overcoat if he is in a Weather Comp (Which should not be the case actually in my honest opinion), Soundproof should be kinda disregarded as there are not many "sound" moves in the game that are abused, but it's always an option too.
Bulky Kommo
Kommo-o (M) @ Weakness Policy / Leftovers
Ability: Bulletproof / Overcoat
EVs: 252 Def / 252 SpD / 4 Atk
Careful Nature
- Dragon Dance
- Brick Break / Dragon Claw
- Counter
- Earthquake / Rock Slide
Careful nature for more SpD, which is to balance out his defenses. Weakness Policy is amazing to keep his offensiveness if you wish so. He becomes a great wall with a high damage output, slower than normal, but when he hits oh boy it hurts. Brick Break for STAB and breaking screens and Dragon Claw for dealing with other Dragons and having another STAB. Counter is a great move overall, and as you probably won't go to low HP too much with this EV spread. Reversal is only good if you often find yourself with low HP obviously and that is something that happens A LOT if you run the first set. Earthquake and Rock Slide for coverage. Dragon Dance is better than Swords Dance here, as you can often get 2-3 of these and go for a high damage, high speed Kommo-o, you basically get all the stats you need to survive and act fast while dealing damage. I put Leftovers for the for those who want consistency, it's not always that you'll get hit with a super effective move to activate Weakness Policy, but I personally prefer the damage over the sustaining capacity.