The Pokédex is a feature that contains a list of all Pokémon that the player has captured and a brief description of each Pokémon. It also displays heights, weights, Pokédex numbers, and models of the Pokémon that have been registered. It can be accessed by pressing a certain key ('I' by default) while looking at a Pokémon or when looking at nothing. Pressing 'I' on a previously unseen wild Pokémon will cause its data to be recorded to the Pokédex. Alternatively, a Pokémon can be obtained (by capture, evolution, trading, etc.) to register its data without having to physically send it out and press 'I' on it.
If in Creative mode, the Pokédex lists all Pokémon up to Generation 5, even those that have not been implemented yet.
Historic
The Pokédex used to be an item that had to be crafted to be accessed.
This recipe does not work anymore.