Gengar

Gengar is a Ghost, Poison-type Pokémon from Kanto region. It evolves from Haunter after being fed with 25 candies and it is final evolution form of Gastly.

Pokédex description
Shadow Pokémon

''Sometimes, on a dark night, your shadow thrown by a streetlight will suddenly and startlingly overtake you. It is actually a Gengar running past you, pretending to be your shadow.''

Evolution family
Gengar is the part of a three-member family.

Trivia

 * As a Raid Boss, Gengar's CP is 19.768.
 * Its maximum capture CP in Bonus Challenge is 1,794.
 * On August, 2016, Gengar's attack Sludge Wave was replaced with Sludge Bomb, which has higher DPS.