Mega Gengar - Halloween 2020 Timed Research Tasks and Rewards
Timed Research
As a part of the Halloween 2020 celebration, a Timed Researched named Mega Gengar was added to PokemonGO, as you might have guessed, this Timed Research revolves around Gengar and its Mega Evolution.

Catch Mastery: Ghost Event - Halloween 2020 Timed Research Tasks and Rewards
Timed Research
As a part of the Halloween 2020 celebration, a Catch Mastery event was added to PokemonGO. Test your skills by catching Ghost-Type Pokemon and earn rewards including Event Gengar, Gengar Mega Energy and increased chance of finding Shiny Drifloon.