Tesco Entertainment said it would sell Pokemon Black and White computer game versions online, beginning March 8.

Both versions of the computer game, which has already sold 5 million copies worldwide, are available for preorder at Tesco Entertainment website for 29.70 pounds. The games could be played on Nintendo DS.

Pokemon Black and White bundles are the next big computer game release out on the market. These bundles were the fastest Nintendo DS games to reach one million pre-order sales in Japan, Tesco Entertainment said in a statement.

A combined total of 156 new Pokemon, all with new features, are being introduced to the Pokemon Black and White bundles, bringing the total number of Pokemon between them to 649.

The two games let people obtain Pokemons from the other game and the ultimate challenge is to obtain all the characters in the Pokindex, the combination of all the 649 characters in Pokemon Black and Pokemon White.

The difference between the two games is they have their own unique versions that have evolved forming different characters, cities, forests and lands. This doubles the excitement for the serious fans.

Zekrom is one example that will star in the White while Reshiram will feature in the Black. The White Forest is in Pokemon White while the Black City will be in Pokemon Black.

Pokemon is a media franchise published and owned by the video game firm Nintendo and created by Satoshi Tajiri in 1996. Since its launch, Pokémon has become the second most successful and lucrative video game-based media franchise in the world, behind only Nintendo's own Mario series.