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Pokémon was originally released in [[Japan]] in 1996 as a pair of cartridges, ''Pokémon Red'' and ''Pokémon Green'', for the original [[Game Boy]] system. Three years later, the games were released as ''Pokémon Red'' and ''Pokémon Blue'' in the United States and worldwide. The games feature similar gameplay, differing primarily in what monsters are available in each version. New versions of the game are released periodically, normally in pairs, to introduce new monsters and to take advantage of improving hardware technology. As of the release of ''Pokémon Black'' and ''Pokémon White'' in 2011 (2010 in Japan), there are 649 species of Pokémon available.

Pokémon was originally released in [[Japan]] in 1996 as a pair of cartridges, ''Pokémon Red'' and ''Pokémon Green'', for the original [[Game Boy]] system. Three years later, the games were released as ''Pokémon Red'' and ''Pokémon Blue'' in the United States and worldwide. The games feature similar gameplay, differing primarily in what monsters are available in each version. New versions of the game are released periodically, normally in pairs, to introduce new monsters and to take advantage of improving hardware technology. As of the release of ''Pokémon Black'' and ''Pokémon White'' in 2011 (2010 in Japan), there are 649 species of Pokémon available.

Players take the role of a Pokémon trainer, seeking to capture wild Pokémon with "Pokéballs", small spheres in which captured creatures live. The player travels across the region challenging other trainers while raising their own Pokémon and capturing new ones. The games normally feature a sub-plot where the player, with the help of their Pokémon, foil the schemes of a criminal organization. The player must challenge eight advanced trainers known as "gym leaders" before they can challenge the "Elite Four" and the "League Champion", five of the strongest trainers in the region. The games also challenge the player to see and capture as many species as possible. However, this is made difficult due to different game versions having exclusive Pokémon, requiring the player to trade with other people who have the opposite game version. Also, certain Pokémon deemed "legendary" can only be obtained by attending [[Nintendo]] hosted events.

Players take the role of a Pokémon trainer, seeking to capture wild Pokémon with "Pokéballs", small spheres in which captured creatures live. The player travels across the region challenging other trainers while raising their own Pokémon and capturing new ones. The games normally feature a sub-plot where the player, with the help of their Pokémon, foil the schemes of a criminal organization or terrorist group trying to use a "legendary" Pokemon to take over the world. The player must challenge eight advanced trainers known as "gym leaders" before they can challenge the "Elite Four" and the "League Champion", five of the strongest trainers in the region. The games also challenge the player to see and capture as many species as possible. However, this is made difficult due to different game versions having exclusive Pokémon, requiring the player to trade with other people who have the opposite game version. Certain Pokemon deemed "legendary" have power far superior to other Pokemon, and only appear once in each game. Some Pokemon are only given in [[Nintendo]]-held events, and while most of these events give away legendary Pokemon that cannot be obtained otherwise, there are many exceptions.

In a battle with a wild Pokémon or a match against a trainer, the player's Pokémon and the foe alternate using learned attack and support techniques, attempting to knock out their opponent. If the player encounters a wild Pokémon, they can elect to attempt to capture it, rather than knocking it out. A captured Pokémon joins the player, who may then raise it or trade it away.

In a battle with a wild Pokémon or a match against a trainer, the player's Pokémon and the foe alternate using up to four learned moves, with the ultimate goal being to knock out the opponent. If the player encounters a wild Pokémon, they can choose to attempt to capture it, rather than knocking it out. A captured Pokémon joins the player, and this is the entire premise behind the series and the only way a trainer can have Pokemon on his team besides his starter.

Many Pokémon, with sufficient training, will spontaneously change form, developing into a larger, stronger form of their species. This process is called "evolution", though it more closely resembles growing up and maturing, or the metamorphism of insects, and has little to nothing to do with the [[Theory of Evolution]]. Some Pokémon species can evolve multiple times, and some species can only be obtained by evolving more basic species. Players may also breed their Pokémon with each other by leaving them with the Day Care man, who will inform the player when the Pokémon lay an egg. Eggs eventually hatch into Pokémon, giving the player another option for acquiring new Pokémon.

Many Pokémon, with sufficient training, will spontaneously change form, developing into a larger, stronger species. This process is called "evolution", though it more closely resembles growing up and maturing, or the metamorphism of insects, and has little to nothing to do with the [[Theory of Evolution]]. Many Pokémon species can evolve multiple times, and many species can only be obtained by evolving more basic ones. In addition, some Pokemon can evolve in more than one different path instead of the linear evolutionary path most Pokemon take, and a good number of Pokemon have gained the ability to evolve in a game after their introduction. Players may also breed their Pokémon with each other by leaving them with the Day Care man, who will inform the player when the Pokémon lay an egg. Eggs eventually hatch into Pokémon, giving the player another option for acquiring new Pokémon.

Additionally, other video games featuring the Pokémon characters have been released, including ''Pokémon Pinball'' and the ''Pokémon Ranger'' series.<ref name="offwev">{{cite web|url=http://www.pokemon.com/#videogames_1|title=Pokemon.com|work=The Official Pokémon Website|format=HTML|language=English}}</ref>

Additionally, other video games featuring the Pokémon characters have been released, including ''Pokémon Pinball'' and the ''Pokémon Ranger'' series.<ref name="offwev">{{cite web|url=http://www.pokemon.com/#videogames_1|title=Pokemon.com|work=The Official Pokémon Website|format=HTML|language=English}}</ref>