New Info?] Looks like Party Hat Gengar will be able to Mega Evolve : r/TheSilphRoad

Does Mega Gengar Keep His Costume? : r/pokemongo

Pokémon Go Ghost type Pokémon - where to find Ghost-types and Ghost Pokémon locations

Mega Evolution Update (GoStadium) : r/TheSilphRoad

Pokémon GO Mega Evolution guide

New Info - Mega Gengar added to the Game Master : r/TheSilphRoad

Gengars spawn on daily incense have its new costume! : r/TheSilphRoad

Gengar POKEMON GRAPHIX NS NEW ERA 59 FIFTY Cap 7 3/8 (58.7 cm) 「 Pocket Monsters 」 Pokemon Center only, Goods / Accessories

Halloween 2020, Pokémon GO Wiki

How to dress up your Pokemon on Pokemon go? Or is it only on Pokemon lets go - Quora

A Mega Moment, Pokémon GO Wiki

Mega Evolution and Gen 6 starters in the 4th anniversary promotional art : r /TheSilphRoad

Mega Evolution PVE Tier List : r/TheSilphRoad

New Year's 2023, Pokémon GO Wiki

Pokemon Go Gengar Day, Shiny Gastly and Mega Evolution 'Confirmed' by Niantic

Gengar, Pokémon GO Wiki