Due to the large number of Pokémon, listing of each species is divided into articles by generation. The 898 Pokémon are organized by their number in the National Pokédex—an in-game electronic encyclopedia that provides various information on Pokémon. The National Pokédex is subdivided into regional Pokédex series, each revolving around species introduced at the time of their respective generations along with older generations. For example, the Johto Pokédex, Generation II, covers the 100 species introduced in "Gold" and "Silver" in addition to the original 151 species. The encyclopedias follow a general ordering: starter Pokémon are listed first, followed by species obtainable early in the respective games, and are concluded with Legendary and Mythical Pokémon. Generation V is a notable exception, as Victini is the first Pokémon in the Unova Pokédex and is also uniquely numbered as number 000.