Akin to the mainline Pokémon games, some Pokémon in Pokémon GO can only be found in certain regions. While developer Niantic has remained steadfast in keeping some the regional exclusives just that, it has bent the rules in some select instances like the first-ever Pokémon GO Fest in Chicago, where Heracross appeared, and the European Safari Zone event. A complete list of known regional exclusives is as follows:
- Tauros – North America
- Farfetch’d – Asia
- Mr. Mime – Europe
- Kangaskhan – Australia
- Heracross – Central and South America, Southern Florida and Texas
- Corsola – Tropical Regions (within approximately 30 degrees of the equator)
Source: Game Informer
Pokémon Blog 