Gender

Gender is a new feature released in Generation II, first for the Pokémon themselves, and then, in Pokémon Crystal, for the Pokémon trainers. This feature allowed for Pokémon breeding, as well as introduced the concept of a Pokémon egg to the series.

Pokémon

Gender also allowed for many Pokémon to have unofficial male and female counterparts, as demonstrated below.

Male	Female
Nidoran♂	Nidoran♀
Nidorino	Nidorina
Nidoking	Nidoqueen
Tauros	Miltank
Volbeat	Illumise
Latios	Latias
Gallade	Gardevoir*
Glalie*	Froslass
Mothim	Wormadam

Generation IV also premiered minimal differences in sprite between two Pokémon of the same species. For example, a male Pikachu will have the full tail seen in previous games, while the female is missing the very tip of it.

Trainers

In Pokémon Crystal, players were given the option of choosing their trainer's gender at the start of the game. Since then, every game in the main series has had that choice.

Game	Male	Female
FireRed	File:Red.png Red	Leaf
LeafGreen
Crystal	File:Gold.gif Gold	File:Kris.gif Kris
Ruby	File:Brendan.png Brendan	May
Sapphire
Emerald*
Diamond	File:Koki.png Lucas	Dawn
Pearl

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