>>54287176high usage doesn't always mean that the metagame is unbalanced
BDSP OU, Scizor highest usage because it didn't lose to numero uno threat Latios or hazard stacking if you Defog with it
Gen I OU, Snorlax Tauros and Chansey are great Pokemon but not actually mandatory or overcentralizing, you can build without them and check them in multiple ways
Gen III OU, Tyranitar is just a good versatile mon that has so many potential uses even if it's not the star of its team
High usage can just mean very good mon, not OP mon, although sometimes it signals the presence of an op mon it's meant to counter