Which Pokémon mobile game surpassed one billion downloads worldwide?

Pokémon Go surpassed one billion downloads worldwide.

Developed by Niantic with Nintendo and The Pokémon Company, Pokémon Go launched in 2016 as a location-based mobile game. It uses GPS, maps, and augmented reality to place Pokémon encounters in the real world.

Players can explore outdoors, visit PokéStops, catch Pokémon, battle at Gyms, and exchange creatures with other players. The game’s launch produced an unusually large cultural event, with crowds gathering at landmarks and public spaces to search for virtual Pokémon.

The billion-download milestone refers to cumulative downloads, not the number of people playing at one moment. It also distinguishes Pokémon Go from other mobile Pokémon titles such as Pokémon Masters EX, Pokémon Unite, and Pokémon Quest.