List of Pokémon with gender differences

Some species of Pokémon have differences in appearance due to gender in the Pokémon world, with noticeable differences between the males and females. With the exception of the differences between and  Nidoran (which are considered distinct species), gender differences were introduced in Generation IV.

These differences are a reference to, which is commonly seen in many real lifeforms and may offer some clues to their biology and behavior.

In, in the gate to Canalave City, Professor Rowan's assistant upgrades the player's Pokédex to be able to display form differences, including gender differences. In subsequent games, they are displayed from the start.

Later generations would introduce far fewer Pokémon with gender differences, but those that were introduced varied much more drastically in appearance. One Pokémon,, even has a different and learns different moves through leveling up depending on its gender.

Trivia

 * is the only pseudo-legendary Pokémon with gender differences.
 * Fairy is the only type that lacks a Pokémon with gender differences.
 * Generation IV introduced the most Pokémon with gender differences, with 31.
 * Generation VI introduced the fewest Pokémon with gender differences of generations that introduce Pokémon with gender differences, with two.
 * Generation VII is the only generation that did not introduce any Pokémon that have gender differences, even though male cannot evolve into.
 * Even though 's gender difference was introduced in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, it was restricted to the player's starter Pokémon.
 * No Mega Evolutions or regional variants have gender differences, even if other forms of the same species do.