Legendary Pokémon (Japanese: 伝説のポケモン Legendary Pokémon) are a group of incredibly rare and often very powerful Pokémon, generally featured prominently in the legends and myths of the Pokémon world.
Mythical Pokémon (Japanese: 幻のポケモン Illusory Pokémon) are a related but separate group of Pokémon seen so rarely that some question their very existence.
List of Legendary and Mythical Pokémon
Of the 722 Pokémon species, 38 are considered to be Legendary (5.26%), and 16 are considered to be Mythical (2.22%).