Answer:
You go into modify your profile, then select your team you want to join and earn points with. Once you have done this defeat 2 Pokemon from a trainer in another team. After this go into team stats then click on the team boost scroll down and click on get team reward. Now you go into attach an item and attach the team boost to your starter Pokemon and battle someone now your team points won't be around 5 per Pokemon defeat it should now be 750 points!
Hope this works 4 u because it did for me!