Once you reach level 5 you will be able to join one of the Teams and catching some good Pokemon. You will be able to challenge Gyms or train at one of your team's Gyms.
Pokemon Gyms are claimed by a team and, based on the Gym’s Prestige level, a number of trainers can assign their Pokemon to protect the Gym. One of those trainers is the Gym Leader. The Gym Leader's level is marked by a crown and has the highest level Combat Power (CP) Pokemon at the Gym.
How to control a Gym
You will need to take over an enemy Gym by depleting its Prestige in order to become a Gym leader. Then the next stage is to find the appropriate Gym to challege. Take a look at your Pokemon, then find a Gym that your team could feasibly defeat. You’re not going to want to take a 117 CP Paras to fight a 1000+ CP Pokemon.
Each Gym will have a different number of trainers, and the first trainers you encounter will have the Pokemon with the lowest CP. The number of trainers at each Gym is dependent on the Gym’s Prestige level. As you defeat them, you’ll lower the Gym’s Prestige and kick out the trainers in the Gym as you hit Prestige benchmarks.
Once you have defeated every trainer in the Gym, the Gym kicks you out. Keep challenging the Gym and you’ll be able to drain the Prestige to zero. Once that team is kicked out, the Gym turns grey and you'll be able to claim the Gym as your own and become a leader.
You will continue to maintain your Leader position as long as your Pokemon has the highest CP in the gym.
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