Egg Group

Egg Groups (Japanese: タマゴグループ Egg Group) are categories which determine which are able to interbreed. The concept was introduced in Generation II, along with breeding. Similar to types, a Pokémon may belong to either one or two Egg Groups.

Egg Groups are based on biological traits of Pokémon species, generally allowing biologically similar species to breed. However, there are some oddities within Egg Groups: for example, the contains a particularly wide variety of Pokémon species, so that seemingly illogical pairings can be noted within it, such as.

Egg Groups are generally preserved along evolutionary lines; however, baby Pokémon,, , and are not in the same group as their evolutionary relatives: Baby Pokémon, Nidorina and Nidoqueen are in the  and thus unable to breed, while the genderless  is in the  (although it requires  to breed due to being genderless).

Egg Groups are not displayed in any core series game; however, they have been canonically mentioned in Pokémon Stadium 2 as a part of Earl Dervish's Pokémon Academy's extensive data banks, in Pokédex 3D, and in various strategy guides.