Team fighting hasn’t been heard of since the pitiful days of the International Fight League, but there are teams in MMA. Team members usually help train other fighters for their upcoming fights and corner their teammates.
Fighters can go ahead and switch training camps at anytime, but most tend to stay loyal to their original team. Sometimes fighters can lose personal relationships over who is the leader of the training camp or who owns the rights to the team.
Part of Team Quest is an example of this.
Fight teams are usually ranked upon success and title belts. Sometimes they are ranked upon potential.
This list is a little bit of both.