Whenever a
Pokémon is first captured, its data
will be added to a player's Pokédex, but in the anime or manga, the Pokédex is a comprehensive electronic reference encyclopedia, usually referred to in order to deliver exposition. of the fictional Pokémon
world, Pokédex is used to refer to a list of Pokémon, usually a list of Pokémon by number. There are three different numbered Pokédex lists to
date: the National Pokédex, introduced in Pokémon Red and Blue, the Johto Pokédex, introduced in Pokémon Gold and Silver, and the Hoenn Pokédex, introduced in Pokémon Ruby and Sapphire and expanded in Fire
Red and Leaf Green. There was also a series of Pokédex toys.