The Pokédex is a fictional electronic device featured in the Pokémon video game and anime series. In the games, 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. "Pokédex" is also used to refer to a list of Pokémon, usually a list of Pokémon by number. In the video games, a Pokémon Trainer is issued a blank device at the start of the journey. A trainer must then attempt to fill the Pokédex by encountering and at least briefly obtaining each of the different species of Pokémon. A player will receive the name and image of a Pokémon after encountering one that was not previously in the Pokédex, typically after battling said Pokémon either in the wild or in a trainer battle (with the exceptions of link battles and tournament battles, such as in the Battle Frontier). In Pokémon Red and Blue, some Pokémon's data is added to the Pokédex simply by viewing the Pokémon, such as in the zoo outside of the Safari Zone. Also, certain NPC characters may add to the Pokédex by explaining what a Pokémon looks like during conversation. More detailed information is available after the player obtains a member of the species, either through capturing the Pokémon in the wild, evolving a previously captured Pokémon, hatching a Pokémon egg (from the second generation onwards), or through a trade with another trainer (either an NPC or another player). This information includes height, weight, species type, and a short description of the Pokémon. Later versions of the Pokédex have more detailed information, like the size of a certain Pokémon compared to the player character, or Pokémon being sorted by their habitat (so far, the latter feature is only in the FireRed and LeafGreen versions). The most current forms of Pokédex are capable of containing information on all Pokémon currently known. The GameCube games, Pokémon Colosseum and Pokémon XD: Gale of Darkness, have a Pokémon Digital Assistant (P★DA) which is similar to the Pokédex, but also tells what types are effective against a Pokémon and gives a description of its abilities.[13]

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