Reserving Kommo-o
Kommo-o @ Kommonium Z
Ability: Overcoat (yay no sandstorm chip)
EVs: 40 Atk / 236 Def / 108 SpA / 68 SpD / 56 Spe
Impish Nature
-
Drain Punch / really any fighting type move of your choice
- Stealth Rock
- Clanging Scales
-
Thunder Punch / Rock Slide
(italics are my default moves for this set)
Kommo-o not only straight up counters this core, but it can set up against it, whether it be Stealth Rock or Kommonium Z..
The set you can use widely varies but I tried to bring a best of both worlds with an Offensive SR set.
EVs are specifically designed to allow Kommo-o the best opportunities with the default moves (specifically in italics) as possible as well as defensive calcs. The SpA EVs are to allow for the -SpA from the Impish nature to balance out and return to it's base SpA (I really didn't know what nature/EVs to give this aside from the 40 Atk, 68 SpD and 56 Spe which are really the only important EVs and I'll explain why with calcs) and the Def EVs are to allow for Kommo-o to switch into TTar as comfortably as possible. Drain Punch is used to allow Kommo-o to abuse TTar's typing and stay healthy. 56 Spe allows Kommo-o to outspeed Zard Y after Kommonium Z omniboost.
And now relevant calcs...
Offensive:
40 Atk Kommo-o Thunder Punch vs. 0 HP / 0 Def Charizard-Mega-Y: 150-178 (50.5 - 59.9%) -- guaranteed OHKO after Stealth Rock
40 Atk Kommo-o Drain Punch vs. 40 HP / 0 Def Tyranitar: 336-400 (95.7 - 113.9%) -- guaranteed OHKO after Stealth Rock
40 Atk Kommo-o Rock Slide vs. 0 HP / 0 Def Charizard-Mega-Y: 300-356 (101 - 119.8%) -- guaranteed OHKO (funny enough 40 Atk is relevant for this move as well)
Defensive:
252 SpA Charizard-Mega-Y Flamethrower vs. 0 HP / 68 SpD Kommo-o in Sun: 114-135 (39.1 - 46.3%) -- guaranteed 3HKO after Stealth Rock
252+ Atk Choice Band Tyranitar Superpower vs. 0 HP / 236+ Def Kommo-o: 137-162 (47 - 55.6%) -- 76.6% chance to 2HKO (however this becomes irrelevant after you realize that you gain most of your health back after drain punch)
Really the only thing that can damper you is burns from Scorching Sands or Flamethrower... But if you haven't used Kommoium-Z you can fend off Zard Y with it, so not all hope would be lost.