Nidoking Can, A 100% MALE Poke'mon Can Breed.
But On The Other Hand...
Nidoqueen Can't AT ALL And It Is A 100% FEMALE
Why Can't It Breed?
I Want A Nidoran (F) But How?
you can't breed nidoqueen because it's in the undiscovered egg group and nidoking is in the field and monster egg group