I set-up a level 10 gym today. After hitting 50,000, I wanted to bump prestige up a little more but could not. A few hours later the gym was briefly attacked and prestige fell to 47,000. I fought back and raised prestige to 49,000, then left for a few hours.
Someone chipped-in with gym defense and currently, the prestige level is exactly (52,000 / 50,000). How is this possible when I couldn't go above 50,000?
Best Answer
Because to put the tenth pokemon into the gym a gym needs to have 50k/50k prestige. At this point you can no longer train the gym to increase the prestige level.
However a gym will still gain the 2k prestige bonus from placing pokemon into the gym. This means that the gym will go to 52k total prestige.
Although I've never seen it, it should also imply that placing multiple pokemon into a gym with 50k prestige will increase the prestige by 2k*number of pokemon. Assuming this is true and a gym is trained to 50k prestige with only one defender, you will be able to increase the prestige to 68k prestige (50k + 2k*9).