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Players will also be able to gain levels, allowing them to encounter and catch more powerful Pokémon, and to acquire more powerful items at the PokéStops. For example, Great Balls might only be available past a certain level.
Exploring real-world locations might also lead the player to discover
gyms. Once they join one of the in-game teams, they may leave up to one Pokémon at each empty gyms or gyms owned by members of their team they encounter. These Pokémon will defend the gym against trainers from the other team, who might attempt to gain control of the gym by challenging its Pokémon in battle.
As previously announced, Pokémon Go will be entering an early user field test in Japan while the game is still in development, and features and design may still change.