Just a tip: if you're going on a gym conquest (or whatever you wanna call it), it's best to do so in teams of 3. Once you've beaten the gym, adding your own pokémon will bring it up to level 2, at which point a second person can add their pokémon, bringing it up to level 3, so then the third person can add their pokémon as well. Level 4 starts at 8000 prestige, though, so that's when the fun ends - unless you wanna continue training there, which can take a while, though.
Went out with my bf on Sunday, and we managed to get a few. Plus, there were some other Instinct members nearby, and although we didn't see them, they added their pokémon as well.