The Pokemon Company has Pokédex (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly $1.99) for a limited time.
Start with the basics, such as what the Pokémon looks like, its type, height, weight, and evolutions, and go from there to explore a rich trove of Pokémon details. You can find your Pokémon’s stats, its moves, TMs you can use on it, its Abilities, all its Pokédex descriptions, where it can be found, its Egg Group, and even what type of moves are strong against it.
Starting with a full-text search, you can search and sort Pokémon not only by their names, but also by combinations of type, Egg Group, Ability, type matchup, and learnable moves. It is always easy to find the Pokémon you’re looking for!
And you’ll find many more ways to enjoy this app! Write memos about particular Pokémon, bookmark your favorites, or use the information to help you plan strategies for the game.