Regions

Regions are an organized areas of the Pokémon world known from previous games about Pokémon such as games from core series. In Pokémon GO there are two regions referred, which are Kanto and Johto.

Kanto
The Pokémon known from Kanto region were the base Pokémon released in Pokémon GO. But not all Pokémon of this Generation were released at this time.

There are currently two Pokémon, that are still not available and not officially scheduled to be released:
 * Mewtwo
 * Mew

History

 * November 22, 2016 – Ditto was released in the games, disguised as other Pokémon.
 * July 22, 2017 to July 30, 2017 – Articuno is available from Raid battles.
 * July 31, 2017 to August 6, 2017 – Moltres will be available from Raid battles.
 * August 7, 2017 to August 12, 2017 – Zapdos will be available from Raid battles.

Johto
Johto is so far second region from which Pokémon are available in Pokémon GO. The Pokémon from this region were firstly released in December 2016 as Baby Pokémon available to hatch from Pokémon Eggs.

There are currently several Pokémon, that are still not available nor officially scheduled to be released:
 * Smeargle
 * Delibird
 * Raikou
 * Entei
 * Suicune
 * Ho-Oh
 * Celebi

History

 * December 12, 2016 - Togepi and Pichu along with another Baby Pokémon and Togetic as evolution of Togepi were released as Pokémon available only to hatch from Pokémon Eggs.
 * February 15, 2017 - over 80 Pokémon from this region were available to catch in the wild and hatch from eggs.
 * July 22, 2017 - Lugia was released as the Legendary Raid Boss and is available to catch only after defeating it.

Trivia

 * Another term used in Pokémon GO players community to describe Pokémon groups from each region is Generations. Which also is valid but it wasn't officially referred in game nor by its creators.
 * Therefore Kanto is Generation I and Johto is Generation II.
 * More about generations you can find here.
 * Common thing for Pokémon, that are not available with main release of each region Pokémon, is that those Pokémon either are legendary and/or mythical or have certain, special moves like Ditto.
 * There are at most sixteen known regions that have appeared in the various Pokémon canons.