The name Pokémon is the romanized contraction of the Japanese brand, , as such contractions are very common in Japan. The term "Pokémon", in addition to referring to the Pokémon franchise itself, also collectively refers to the 493 fictional species that have made appearances in Pokémon media as of the recent release of the newest Pokémon role-playing games (RPGs) for the Nintendo DS, Pokémon Diamond and Pearl. Like the words deer and sheep, the word "Pokémon" is identical in both the singular and plural, as is each individual species name; in short, it is grammatically correct to say both "one Pokémon" and "many Pokémon". In November 2005, 4Kids Entertainment, which had managed the non-game related licensing of Pokémon, announced that it had agreed not to renew the Pokémon representation agreement. Pokémon USA Inc., a subsidiary of Japan's Pokémon Co., now oversees all Pokémon licensing outside of Asia.

Collecting and playing

The concept of the Pokémon universe, in both the video games and the general fictional world of Pokémon, stems from the hobby of insect collecting, a popular pastime which Pokémon executive director Satoshi Tajiri-Oniwa enjoyed as a child. Players of the games are designated as Pokémon Trainers, and the two general goals (in most Pokémon games) for such Trainers are: to complete the Pokédex by collecting all of the available Pokémon species found in the fictional region where that game takes place; and to train a team of powerful Pokémon from those they have caught to compete against teams owned by other Trainers, and eventually become the strongest Trainer, the Pokémon Master. These themes of collecting, training, and battling are present in almost every version of the Pokémon franchise, including the video games, the anime and manga series, and the Pokémon Trading Card Game.

In most incarnations of the fictional Pokémon universe, a Trainer that encounters a wild Pokémon is able to capture that Pokémon by throwing a specially designed, mass-producible tool called a Poké Ball at it. If the Pokémon is unable to escape the confines of the Poké Ball, that Pokémon is officially considered under the ownership of that Trainer. Afterward, it will obey whatever commands its new master issues to it from that point onward, unless the Trainer demonstrates enough of a lack of experience that the Pokémon would rather act on its own accord. Trainers can send out any of their Pokémon to wage non-lethal battles against other Pokémon; if the opposing Pokémon is wild, the Trainer can capture that Pokémon with a Poké Ball, increasing his or her collection of creatures. Pokémon already owned by other Trainers cannot be captured, except under special circumstances in certain games. If a Pokémon fully defeats an opponent in battle so that the opponent is knocked out (i.e., "faints"), the winning Pokémon gains experience and may level up. When leveling up, the Pokémon's statistics ("stats") of battling aptitude increase, such as Attack and Speed. From time to time the Pokémon may also learn new moves, which are techniques used in battle. In addition, many species of Pokémon possess the ability to undergo a form of metamorphosis and transform into a similar but stronger species of Pokémon, a process called evolution.