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They really need to let you add multiple of your own pokemon if you take the time to level up a gym you conquered. The only way to really hold down gyms for extended periods is going around with MINIMUM one other player who's on your team. And when you're Team Instinct all that happens is you beat a gym, deposit your best because that's all you can do, claim your daily 10 coins and wait for Valor or Mystic to come by within an hour or two and take it back.