More than 80 additional Pokémon were recently added to Pokémon GO, a number of which have been proving to be very difficult to find. The mysterious Symbol Pokémon, Unown, is one of them. There are a total of 26 Unown – each of which represents a letter of the alphabet. So far, Pokémon GO users have rarely seen even one of them, but they do exist and a select number of users managed to capture some of them. Good luck to anyone who’s trying to find them all!
Source: Polygon
Pokémon Blog 