Pokédex

The Pokédex
Pokédexes are vital pieces of technology for every Pokémon Trainer. Most regions give starting Trainers a Pokédex for free; presumably, there is some kind of financial deal between the regions and the companies that manufacture the Pokédexes to offset the costs.

All Pokédexes come with the ability to capture images and information on Pokémon seen or caught, and to catalogue that information. Different models come with different capabilities.

Pokédexes have existed for at least twenty years prior to Rose and Cobalt beginning their adventures, as it is mentioned that Red carried a Pokédex. Professor Samuel Oak was likely the creator of the Pokédex.

The Kanto Pokédex
The Kanto Pokédex is the version that Rose and Cobalt receive at the start of their journey. It comes with the basic information and cataloguing features that are common to all Pokédexes, plus extra enhancements. New Kanto Pokédexes are approximately 5.5" x 2.6" x 1.5", and include a dial for scrolling through applications, a pop-out camera, and a touch screen. Kanto Pokédexes are also capable of using NFC, or Near Field Communications, to sync with the Trainer's cell phone: this allows Trainers to send and receive voice calls and texts through their Pokédex.  Kanto Pokédexes are also capable of sending and receiving different kinds of data, such as downloading applications from outside sources and computer terminals.  Trainers can also "bump" their Pokédexes together to share simple information, such as their contact information, with each other.

The Kalos Pokédex
Only one example of the Kalosian Pokédex has been shown so far, belonging to the Gym Leader Trajan. His is notably out-of-date and beaten up.