>>56304256Assuming true dark type also works like how Dark type does with what resists it, Vicious Mawling is a big lmao against fighting, fairy and other dark type mons. And since it still has rock type, it means fighting types also blow it out if they can land a good hit. Which means that assuming the stats here are what it has by lvl 100 as per smogon rules:
"+1 252+ Atk Choice Band Zacian Close Combat vs. 92 HP / 4 Def Corrupted Mega Tyranitar: 362-426 (89.6 - 105.4%) -- guaranteed OHKO after Stealth Rock"
Just get down some sneaky pebbles with whatever mon you think can tank the first turn, bring out sword dog and then gg no re. And even IF sword dog is not allowed, since you can use Megas, there's one easy option to clown on this Nega Godzilla ripoff:
"252 Atk Life Orb Tough Claws Lucario-Mega Close Combat vs. 92 HP / 4 Def Corrupted Mega Tyranitar: 424-502 (104.9 - 124.2%) -- guaranteed OHKO"