The Pokémon Company has finally made an English version of the Pokédex app for iOS.  

The Pokédex will be $1.99 and only contain the fifth generation Pokémon from the Unova region. The Kanto, Johto, Hoenn, and Sinnoh region Pokémon data entries will cost $5.99 each, raising the price to approximately $26 for the full iOS Pokédex experience. 

[via Joystiq