The Niantic continues additions to Pokemon GO, announcing a change after another. Thus, only a few days after the "catch bonus announcement" about which you can read here , we have changes in the Training System of gyms (Gyms).
Plus, users can choose 6 Pokemon which can be managed at a friendly fitness center (Gym). At the same time, the CP of Pokemon with which to fight / train will be adjusted according to the level of 6 Pokemon user, so it becomes easier to process the Training and gyms to climb easier levels.
In the example below you can see how a Dragonite with CP 1208 CP adapts to the 6 Pokemon chosen by the user for the Training session of Gym:
As we can see, the CP of Dragonite which "protects" the Gym reduced from 733 in 1208 to be in the same price range as 6 CP user carrying out the attack on the training session.
Followed by the announcement of Niantic:
As we continue to make improvements to GO Pokémon, we have made an enhancement to the Gym experience for Trainers of all levels. In an upcoming version of GO Pokémon, when training at a friendly Gym, Trainers will be able to bring six Pokémon to battle instead of one. In addition, the CP of the Pokémon you are training against may be temporarily adjusted lower during your training session to generally match your Pokémon's battle capabilities.
No matter what your level, you can now have an impact on your team's Gym. Walk with your Buddy Pokémon to that nearby landmark and show your Team Leader that you can battle with the best!