Gender

Gender is a 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. Gender makes no difference in the stats of a Pokémon after Generation II, unless the two Pokémon are a different species entirely, such as Nidoran.

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
*Can be either gender

Gender differences

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

Gender-based evolution

Some Pokémon evolutions can only be obtained if they are of a certain gender:

• Female Combee evolve into Vespiquen at level 21. Male Combee never evolve.
• At level 20, female Burmy will evolve into Wormadam and male Burmy evolve into Mothim.
• Only male Kirlia can evolve into Gallade.
• Only female Snorunt can evolve into Froslass.

Single-gender Pokémon

Several Pokémon are also only of one gender, yet do not have an official or unofficial counterpart of the other. Most of the single-gender Pokémon with no counterpart are female, and only six evolution families total (five of which are female-only) are of this type.

Pokémon	Gender		Pokémon	Gender		Pokémon	Gender
Happiny	♀		Smoochum	♀		Tyrogue	♂
Chansey	♀		Jynx	♀		Hitmonlee	♂
Blissey	♀		Vespiquen	♀		Hitmonchan	♂
Kangaskhan	♀		Cresselia	♀		Hitmontop	♂

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
Pokémon FireRed	Red	Leaf
Pokémon LeafGreen
Pokémon Crystal	Gold	Kris
Pokémon Ruby	Brendan	May
Pokémon Sapphire
Pokémon Emerald*
Pokémon Diamond	Lucas	Dawn
Pokémon Pearl
Pokémon Platinum*

Trivia

• Due to the programming in the Generation II games, female Pokémon can never have a maximized Attack stat unless they are a female-only species such as Miltank; this is because female Pokémon cannot have Attack IVs greater than or equal to a value based on their gender ratio. Female-only species have a 100%, or sixteen-out-of-sixteen, chance to be female, so their Attack IV can be anywhere in the 0-15 range, which is sixteen values. Pokémon who have a 12.5% chance to be female, such as starter Pokémon, only have a two-out-of-sixteen chance to be female, which means that they can only have a zero or one Attack IV. Because the majority of Pokémon species have a 50/50 gender ratio, a typical female Pokémon cannot have an Attack IV greater than seven (corresponding to the 0-7 IV range). In later generations, female Pokémon do not have these restrictions.