With Buddy Controller, you can combine two game controllers to play games on Apple TV as a single player. This makes it easier for people to learn how to play or get to the next level with some assistance from a friend. Only one controller at a time can be set as the primary controller.
Open Settings
on Apple TV, then go to Remotes and Devices > Bluetooth.
Connect two compatible game controllers to Apple TV.
If you need help, select How to Pair Game Controllers and follow the onscreen instructions.
Under My Devices, select the connected game controller you want to use as the primary controller.
Select Buddy Controller, then select the controller you want to be the secondary controller.
To turn off Buddy Controller, select Buddy Controller, then select Unset.