Using a fake GPS joystick for Pokemon Go can be a violation of the game's terms of service and can result in your account being banned. However, assuming you're asking this question from a purely technical standpoint, here's a general guide on how a fake GPS joystick works.
1. Research and Install a Reliable App: Look for a reputable app that provides fake GPS functionality and joystick controls. Make sure to download from a trusted source, such as the official app store for your device.
2. Enable Developer Options: To use a fake GPS joystick, you need to enable Developer Options on your device. Go to your device's Settings, then tap on About Phone. Look for the Build Number and tap on it repeatedly until you see a message confirming that Developer Options have been enabled.
3. Access Developer Options: Now, go back to the main Settings menu and scroll down to find Developer Options. Tap on it to open the Developer Options menu.
4. Select Mock Location App: Within Developer Options, find the "Select mock location app" setting. Tap on it and choose the GPS joystick app that you installed earlier.
5. Configure GPS Joystick App: Open the GPS joystick app and set your desired location on the map. Some apps allow you to search for specific locations or input coordinates directly. Make sure to place the joystick on a location that matches with the desired location in Pokemon Go.
6. Launch Pokemon Go: Open the Pokemon Go app and check if the joystick is working correctly. You should be able to move around the game world without physically being at that location.
Remember, using fake GPS or any other cheat methods in Pokemon Go goes against the game's terms of service. Niantic, the developer of Pokemon Go, actively monitors and takes action against accounts found using cheats. So, proceed with caution, as you risk losing your account permanently if caught.
It's always recommended to play the game within the rules and guidelines set by the developers to ensure a fair gaming experience for everyone involved.