Gengar

Gengar is a Ghost, Poison-type Pokémon from the Kanto region. It evolves from Haunter after being fed 100 candies or with no candy cost if traded. Gengar is the final evolution of Gastly. It can Mega Evolve into Mega Gengar initially after being given 200 Mega Energy, and 40 afterwards.

Trivia

 * Normally, evolved stages of Pokémon cannot be shiny in encounter screen, but exceptionally during Special Raid Challenge, Gengar could.
 * Its was a tier Raid Boss during the Special Raid Challenge.
 * On August, 2016, Sludge Wave was replaced with Sludge Bomb.
 * During the Halloween event in 2017, there were shiny forms of Gastly family members added to game data, although they weren't released to be caught in gameplay.
 * Nidorino and Gengar Raid Day was canceled in Japan, South Korea and Italy due to COVID-19 pandemic.