Region-exclusive Pokémon

Region-exclusive Pokémon, also known as regional Pokémon, are group of Pokémon that are exclusive for specific regions in the real world and are available for capture only by encountering them in wild—in these specific regions.

Currently in game there are 14 Pokémon that are region-exclusive, the most of them come from the Hoenn region.

Kanto
There are four region-exclusive Pokémon from the Kanto region:

Johto
There are two region-exclusive Pokémon from the Johto region:

Hoenn
There are eight region-exclusive Pokémon from the Hoenn region:

Trivia

 * Farfetch'd started appearing globally around 05:00 PM PST, as the reward of Global Catch Challenge, for 48 hours starting on November.
 * It was available to capture in the wild and could also be summoned with Lure Modules and Incense.