The Pokemon Go Pokedex is an electronic encyclopedia of all the Pokemon you catch or evolve in the game. It will record how may times you have seen a particular Pokemon and how many times you successfully catch it too. It will also give you some very useful information about that specific Pokemon, such as: Weight, Height, Type and Bio. You will also be shown a super helpful picture chart of its evolution too.
Thanks Professor Oak!! Really Cool Stuff!
HOW DO I ACCESS MY POKEMON GO POKEDEX?
From the home screen, click the red and white Pokeball. Now select the Pokedex icon.