The Master Ball, the ultimate ball from the Pokémon franchise that never fails to make its catch, is finally coming to Pokémon GO.
It will be made part of a Seasonal Special Research, which are long-form quests with various stages of tasks that trainers must complete before receiving great rewards.
Season 10: Rising Heroes will premiere on May 22, 2023, at 10:00 am LT. The Master Ball will be part of the set of rewards for completing the research. However, the questline will only be available to claim until June 1, 2023, at 10:00 am LT.
Fortunately, Special Field Research tasks remain permanently bound to your account even after the event expires, as long as you claimed them while the event was going on.
Niantic clearly wants to gather data from trainers about their favorite Pokémon, as this is clearly being advertised as a rare and unique occasion. However, they have already hinted that there will be opportunities down the line to acquire more.