Similar to a PDA in our reality, this device was invented by in game character Professor Samuel Oak a respected Professor in the science of pok?on.
The device was designed to catalogue and provide information regarding originally 150 species of pok?on.
As with the further development of the series starting with Pok?on Green, Pok?on Red and Pok?on Blue, the device itself was updated and changed in the game to appear more high tech and to gather more information than ever including the new total of 386 unique species of pok?on.
Each Trainer in the game is issued a blank device and must collect information about each species that the player encounters in the game which is easilly done simply by finding such a species, or capturing one by either traditional methods of a battle or by trade.
Each region in the Pok?on world favours its own Regional Pok?ex as a default setting but honours the National Pok?ex as the official standard.