Nidoran was the first Pokémon to feature gender differences, and even gender; however, their difference is much greater than most later Pokémon.
Despite the addition of genders in all Pokémon starting in Generation II, the two variations of Nidoran remained separate species, rather than a singular species that splits down different evolution paths based on gender.
When an Egg is produced from Nidoran and Ditto parents, the gender ratio of the Egg favors the gender of the non-Ditto parent by an unknown margin.
A Nidoran♀ Egg has a chance of hatching into a Nidoran♂ when bred with a non-Nidoran♂ compatible father.
Nidoran♂ and its evolution share their category with their female counterparts Nidoran♀ and Nidorina. They are all known as the Poison Pin Pokémon.
Due to the fact that its gender, ♂, is included in its name, checking Nidoran♂'s summary from Generation II onward will display as if it were genderless if it does not have a nickname. If its nickname is anything other than "Nidoran♂", its gender will appear as normal.
Nidoran♂ is the only Pokémon with a base stat total of 273.
