Say a red team gym with 7000 Prestige has three Pokemon defending it, a 500 CP Golbat, a 700 CP Pinser, and a 1500 CP Snorlax.
As a blue team member you attack the gym and defeat the Golbat and the Pinser but the Snorlax takes out all your remaining Pokemon.
Will the gyms prestige go up, down, or be unchanged?
Best Answer
The gyms prestige will go down if you can only defeat some of the Pokémon, but not as much as if you can defeat all of the Pokémon. If you can keep taking down a few Pokémon each time you attack a gym, you will continue to take away some of the prestige each time.
source- personal experience from taking down level 9+ gyms.