The Pokédex is one of the main elements of the game. It is a compendium of information about every Pokémon already caught and seen by player. It becomes more complete as trainers own and encounter new Pokémon.
To access the page of Pokédex in game:
On the top of Pokédex page there are two player's stats, which are number of already caught and seen Pokémon.
Below them there are tabs with each region Pokémon and number of these Pokémon currently caught. Additionally when the Kanto tab is selected and it is top of the Pokédex scrollable page, currently owned Medals related to each region Pokémon appears above the respective tabs.
Whole, long page of Pokédex is filled with fields for every Pokémon species in game. There are three types of such fields:
- non-interactive tile with a number of Pokémon species - species of this Pokémon has never been caught nor seen by player,
- tile with shadow, monochromatic silhouette of Pokémon - species of this Pokémon has been only seen by a player (either has been seen in gym or encountered in the wild but has not been caught),
- after tapping such field, player access incomplete Pokédex entry of specific Pokémon species,
- field without background-tile and coloured image of Pokémon species - species of this Pokémon has been caught by player already,
- after tapping such field, player access complete Pokédex entry of specific Pokémon species.
Initially not all of the number tiles appear, but only those ones up to the field of Pokémon species that has been caught or seen with the highest Pokédex number in each region. There are different colors of tiles in each section for Pokémon species from each region:
- Tiles from #1 to #151, responding to species from Kanto are pale purple,
- Tiles from #152 to #251, responding to species from Johto are pale blue,
- Tiles from #252 to #386, responding to species from Hoenn are pale purple,
- Tiles from #387 to #493, responding to species from Sinnoh are pale blue,
- Tiles from #494 to #649, responding to species from Unova are pale purple,
- Tiles from #650 to #721, responding to species from Kalos are pale purple,
- Tiles responding to species from Galar are pale red,
- Tiles #808 and #809, which are for Meltan and Melmetal from an unknown region are pale red.
Also each section of such Pokémon has a header line with the name of region.
In the bottom right corner of the page there is a button that allows to change view between standard Pokédex and Mega Pokédex.
There are three ways to exit from the page of Pokédex:
- by tapping on return button on the player's mobile device (not available for iPhone users for obvious reason),
- by tapping on the exit button on the bottom of screen,
- by swiping down at the very top of the list, which cause X icon appeared and then release.
In addition to standard Pokédex, there is also a Mega Pokédex that registers all Mega Evolved forms of Pokémon. Similarly to Pokémon species, each Mega Evolved Pokémon has its own entry.
Unlike standard Pokédex, Mega Pokédex view is hued bright red instead of bright purple and it is not split into region sections nor it has any region Pokédex medals at the top of the page.
Pokédex entries are basically separate pages with information about specific Pokémon species. There are two kinds of these entries: complete and incomplete ones.
Incomplete entries consist of:
- 3D, animated and turnable Pokémon's image,
- Pokédex number and Pokémon's name,
- switch buttons between genders and/or forms,
- amount of seen, caught, lucky and purified Pokémon of that species (in this case only seen is not 0).
While complete ones has also:
- regular weight and height of Pokémon,
- Pokémon's type(s),
- category of Pokémon (e.g. Drill Pokémon, Volcano Pokémon, Armor Pokémon),
- short description of Pokémon's species,
- evolution line of Pokémon.
Pokémon form switches
Depending on what forms of each Pokémon were caught by trainer already, respective form switches appear underneath Pokémon's 3D image.
Registering a Shiny Pokémon will also register the non-shiny form to the Pokédex, if the Pokémon was not previously registered.
If player obtained for the last time particular Pokémon of any gender sometime before December, 2016, it might cause that both gender form switches appear as Pokémon were only seen, despite the complete Pokédex entry and exact Pokémon being already in player's Pokémon collection. 
Switches for only-seen Pokémon forms cannot be clicked since the version 0.89.1. Therefore even if player has seen female form of Pokémon in gym or has encountered it in wild but not caught, in Pokédex only male form is seen in its complete Pokédex entry.
Below there are assets for certain groups of Pokédex entry switch buttons for each Pokémon form.
|Caught female form switch unselected||Caught female form switch selected|
|Caught female shiny form switch unselected||Caught female shiny form switch selected|
|Seen female form switch||Seen female shiny form switch|
|Caught male form switch unselected||Caught male form switch selected|
|Caught male shiny form switch unselected||Caught male shiny form switch selected|
|Seen male form switch||Seen male shiny form switch|
|Caught genderless form switch unselected||Caught genderless form switch selected|
|Caught genderless shiny form switch unselected||Caught genderless shiny form switch selected|
|Seen genderless form switch||Seen genderless shiny form switch|
|Caught Unown A form switch unselected||Caught Unown A form switch selected||Caught Unown B form switch unselected||Caught Unown B form switch selected|
|Caught Unown C form switch unselected||Caught Unown C form switch selected||Caught Unown D form switch unselected||Caught Unown D form switch selected|
|Caught Unown E form switch unselected||Caught Unown E form switch selected||Caught Unown F form switch unselected||Caught Unown F form switch selected|
|Caught Unown G form switch unselected||Caught Unown G form switch selected||Caught Unown H form switch unselected||Caught Unown H form switch selected|
|Caught Unown I form switch unselected||Caught Unown I form switch selected||Caught Unown J form switch unselected||Caught Unown J form switch selected|
|Caught Unown K form switch unselected||Caught Unown K form switch selected||Caught Unown L form switch unselected||Caught Unown L form switch selected|
|Caught Unown M form switch unselected||Caught Unown M form switch selected||Caught Unown N form switch unselected||Caught Unown N form switch selected|
|Caught Unown O form switch unselected||Caught Unown O form switch selected||Caught Unown P form switch unselected||Caught Unown P form switch selected|
|Caught Unown Q form switch unselected||Caught Unown Q form switch selected||Caught Unown R form switch unselected||Caught Unown R form switch selected|
|Caught Unown S form switch unselected||Caught Unown S form switch selected||Caught Unown T form switch unselected||Caught Unown T form switch selected|
|Caught Unown U form switch unselected||Caught Unown U form switch selected||Caught Unown V form switch unselected||Caught Unown V form switch selected|
|Caught Unown W form switch unselected||Caught Unown W form switch selected||Caught Unown X form switch unselected||Caught Unown X form switch selected|
|Caught Unown Y form switch unselected||Caught Unown Y form switch selected||Caught Unown Z form switch unselected||Caught Unown Z form switch selected|
|Caught Unown ! form switch unselected||Caught Unown ! form switch selected||Caught Unown ? form switch unselected||Caught Unown ? form switch selected|
|Rotom Base form switch||Rotom Heat form switch|
|Rotom Wash form switch||Rotom Frost form switch|
|Rotom Fan form switch||Rotom Mow form switch|
It will be corrected soon.
Version 0.191.0 introduced the function to visit another entry by tapping the another Pokémon in the evolution line. A button is also located at the bottom of Pokédex entry to check all that in Trainer's collection.
- Main article: Pokédex/Gallery
- As of October 7th, 2016, Pokémon encountered at a gym will appear as a shadowed version in the Pokédex with limited information even if they have never been encountered in the wild.
- File:Nidoking Pokedex.png, File:Lapras Pokedex.png, File:Snorlax Pokedex.png
- Tapping on the evolution in the Pokedex now takes you directly to that Pokémon’s entry!. /r/TheSilphRoad. Retrieved on 2020-12-15.
- 2016-10-07. New Gym Feature Adds Pokémon to Pokedex. Pokémon GO Hub. Retrieved on 2016-10-09.