Battling at Gyms, feed to Pokemon at Gym.

Battling at Gyms

https://niantic.helpshift.com/a/pokemon-go/?l=en&p=web&s=gyms-battle&f=battling-at-gyms

Gym overview

Gyms are locations found throughout the world where you can battle the Pokémon of rival teams. Trainers from opposing teams battle for control of the Gyms. Each Gym has up to six Pokémon assigned to defend it. Trainers from an opposing team can bring six of their own Pokémon to battle against the defenders, in hopes of claiming the Gym for their own team.

A Pokémon’s ability to be successful in battle is primarily influenced by its Hit Points (HP) and Combat Power (CP). HP is a measurement of the Pokémon’s health, and CP is a measurement of the strength of their attacks. Pokémon with high CP and high HP have powerful attacks as well as the ability to withstand attacks from opponents.

Every Pokémon on a Gym has motivation, a measurement of the Pokémon’s desire to defend the location. Trainers from opposing teams battle to reduce the motivation of the Pokémon on the Gym. Pokémon gradually lose motivation over time and by losing battles against opposing team members. As a Pokémon loses motivation, its CP will temporarily decrease, making it weaker in battle. When a Pokémon’s motivation reaches zero, it leaves the Gym and returns to its Trainer the next time it loses a battle.

For Gyms controlled by your team, your goal is to keep motivation up by giving the Pokémon treats. For Gyms controlled by opposing teams, your goal is to gain control of the Gym by depleting the motivation of opposing team’s Pokémon.

Feed Berry

You can give Berries to any Pokémon on Gyms controlled by your team. You can give any kind of Berry to Pokémon - Golden Razz Berries, Razz Berries, Nanab Berries, and Pinap Berries. All Berries provide the same increase in motivation, with the exception of the Golden Razz Berry, which fully restores motivation.

Battle at Gyms  

When battling Pokémon, you battle Pokémon in the order they were assigned to the Gym; the Pokémon on the Gym for the longest time will battle first.