Pokémon (abbreviated from Pocket Monsters (ポケットモンスター, Poketto Monsutā?) in Japan) is an ongoing Japanese animated series, which has since been adapted for the North American and European television market. It is somewhat based on the Pokémon video game series and a part of the Pokémon franchise.

Originally a single series, Pokémon, it has since been made into three series, including Pokémon: Advanced Generation and subsequently Pokémon Diamond & Pearl, which continue the story of Pokémon, while its spin-off Pokémon Chronicles or, as it is known in Japan, Pokémon Sunday (formerly Shūkan Pokémon Hōsōkyoku) is a series of stories revolving around some of the recurring characters.

Source: Wikipedia