Overview
Mythical Pokémon (伝説ポケモン, Maboroshi no Pokemon, lit "Illusory Pokémon") is a generic term for Pokémon that exist in the data but cannot be encountered in the game.
Unlike banned and quasi-legendary Pokémon, this is an official term.
Originally, Mythical Pokémon are in a different category from Legendary Pokémon, but in many cases, such as Arceus, they are closely related to Pokémon that are key points of the work or have their own lore or mythology.
Related Articles
Pokémon Nintendo Video Game Pokemon List
External Links
English
Mythical Pokémon - Bulbapedia, the community-driven Pokémon encyclopedia