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https://pokemonblog.com/2020/09/21/new-timed-research-now-available-to-unlock-exclusive-timed-research-during-this-years-halloween-event-that-features-mega-gengar-for-the-first-time-in-pokemon-go/
New Timed Research now available to unlock exclusive Timed Research during this year's Halloween Event that features Mega Gengar for the first time in Pokemon GO