You need to capture the following number of Pokémon to unlock each legendary: In addition, capturing legendary Pokémon will require using a Master Ball. Master Balls are unlocked upon capturing 5, 20, ...

Google and Pokémon drop a new yet nostalgic Easter egg: a mobile-only game that lets fans catch all 151 original Pokémon.

After a set Pokémon number has been captured ... with the additional Master Balls awarded after 50, 100, and 150 Pokémon are caught to attempt on Moltres, Mewtwo, and Mew, respectively.