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I dont train up gyms anymore.
I just find gyms where local tryhards like to stick their mons. I take down the gym's level all the way to 1 with 1k prestige and leave it like that so they have to work extra hard to level it back up instead of getting 3 free spots. The best is when the top mon is a dragonite so it's even harder for them to level it up hahahahaha