>>20677558So just for run I used PS' calculator using Aurorus (worst possible defensive type), giving it base 250 stats across the board, no competitive ability, max HP and Atk EVs, Return and HP Fire. Here are a few interesting calcs:
252+ Atk Aurorus Return vs. 252 HP / 0 Def Arceus: 175-206 (39.4 - 46.3%) -- guaranteed 3HKO
252+ Atk Technician Mega Scizor Bullet Punch vs. 252 HP / 0- Def Aurorus: 232-280 (32.9 - 39.7%) -- 22.2% chance to 3HKO after Leftovers recovery
4 SpA Aurorus Hidden Power Fire vs. 248 HP / 8 SpD Mega Scizor: 388-460 (113.1 - 134.1%) -- guaranteed OHKO
252 Atk Adaptability Mega Lucario Close Combat vs. 252 HP / 0- Def Aurorus: 560-664 (79.5 - 94.3%) -- guaranteed 2HKO after Leftovers recovery
4 SpA Aurorus Hidden Power Fire vs. 0 HP / 4 SpD Mega Lucario: 260-308 (92.5 - 109.6%) -- 56.3% chance to OHKO
Yeah.... I'd say high enough stats break everything. The same can't be said about movepool (else Smeargle would be broken), ability (Wonder Guard is arguably the best ability in the game but still doesn't break Shedinja) and type (Klefki isn't broken, among other things with godly typing).