If you are the team leader, you can choose another member of your team to serve as co-leader!

• In order to promote players to co-leader follow the instructions;

• To open the Team menu, tap the Team menu button.

• At the top, select the "My Team" tab.

• To make a player a co-leader, simply tap on their name.

• Choose "Make Co-Leader" by tapping it.

• The co-leader shares the qualities of the leader. If the team is set to closed, a co-leader can answer join requests, update the team's information and level requirements, and kick team members—except the team leader—from the group.
  
  

Also you don't have to "kick" a co-leader from the team if you wish to demote them.

• In order to demote players from co-leader follow the instructions;

• To open the Team menu, tap the Team menu button.

• At the top, select the "My Team" tab.

• You can demote a co-leader by tapping on their name.

• Choose "Demote Co-Leader" by tapping it.