First you customize your trainer, catch Pokemon and add them in Pokedex and later when you level up you can join team and battles.
It's free to play game which you can download at Google Play and App Store (Not available for all continents, but the company is working on it).
Known issues:
- Receive "You already own this item" error message (Android only)
If your device loses Internet connectivity while purchasing PokeCoins from the shop, you may receive the "You already own this item" error message. Please power off and restart your device to resolve this issue.
- Trainer progress temporarily resets to Level 1
You may have inadvertently created two Pokemon GO accounts: one account using Google and one using Pokemon Trainer Club. If you create an account with one login method and later attempt to use the other login method, a second account is created. To resolve this issue, log out of your account via the Settings menu and then log back in with your original login method.
- Distorted audio
In some situations, music and sound effects within Pokemon GO app may become distorted or delayed. This issue often occurs while connected to Bluetooth audio. We aware of the issue and we are actively working on a solution.
- Heavy battery use
Some devices may experience battery drain while playing Pokemon GO for prolonged periods of time. We are working on a solution.
- My location is incorrect, unavailable, or jitters/drifts
We are constantly working to improve GPS accuracy and stability. In general, GPS accuracy largely depends on the device you're using and your signal/connection strength. To improve your device's location, please review the following settings:
- Pokemon GO has location permissions enabled
- Interned connectivity is enabled (3G, 4G, Wi-Fi)
- Device location/GPS is enabled
- Location/GPS set to high-accuracy mode
credits: Gamestop