brightknightie | Why to feed berries in Pokémon Go

At a Kyogre raid recently, I met a couple of people who hadn't yet learned the side benefits of feeding berries at pokégyms! Just in case, let me spread the good word. In addition to filling a pokémon's strength meter, keeping that pokémon in that gym, and keeping the gym your team's color (for increased resources for you each time you spin or raid there), you'll want to feed berries to pokémon in your team's gyms in order to:

Get 20 stardust per fed berry
Get 20 XP per fed berry
At ~1-in-100 odds, get 1 of the fed pokemon's candy in exchange for a fed berry
Incrementally raise your medal at that gym (higher medals yield more resources per spin, and higher chances for EX raid invitations)

Because of the 1-in-100 candy-back reward, I actually have candy for pokémon not yet in my 'dex, like Kangaskhan. :-) It's also an incentive to put rare pokémon in gyms, so that you can feed them berries and win their candy. Lately, I keep putting my Kirlia in gyms, for more Ralts candy to power up my Gardevoir (unless I really need to help hold the gym for my team, in which case it's always Blissey or Chansey, of course).