Unown

Unown is extremely-rare Psychic-type Pokémon from Hoenn region. It does not evolve into nor from any other Pokémon. Unown is also the rarest Pokémon in the game.

Pokédex description
Symbol Pokémon

''This Pokémon is shaped like ancient writing. It is a mystery as to which came first, the ancient writings or the various Unown. Research into this topic is ongoing but nothing is known.''

Possible attacks
Fast attacks Charged attacks

Evolution family
Unown is part of a one-member family.

Forms
There are a total of 28 unique forms of Unown in the game with only the 26 letters of the available.

Trivia

 * There are currently 26 unique forms of Unown available in Pokémon GO, one for each letter of the alphabet. In the main series, there are a total of 28 forms (! And ?) starting with Generation 3.
 * As of April 10, 2017, Unown is the rarest Pokémon to encounter in the wild.
 * Considerably, Unown is the most highly prized possession in the game making it a huge stepping stone for players.
 * Unown often spawns in inaccessible areas, making it very hard to find. Only the most dedicated players will find this Pokémon.
 * The spawn rate of Unown in the wild is estimated to be ×27.5 rarer than Tyranitar, and an estimated ×42.3 rarer than Dragonite, which are often seen as the rarest species in the game.