If you need to stock up on lure modules and incense but don’t want to spend the money, there are other ways to get coins. One Reddit user shared this guide to getting the maximum amount of coins a week. That’s 800+ coins! Here’s everything you need to know:
Let me sum this up for you. Basically, you want to defend gyms that are hard to get to. The harder the gym is to get to, the longer you’ll hold onto the gym. Holding a gym is good because it grants you coins in the “Store” section. You can only keep up to 10 Pokémon in respective gyms at a time.
As far as defenders go, you’re going to want to leave a strong Pokemon like Lapras, Snorlax, Slowbro, Exeggutor, Vaporoeon, or Dragonite. Set up an alarm for 21 hours every time you redeem coins and stardust. Doing so grants you 800 coins and 40000 stardust. There are still a lot of good tips in the guide above so make sure you look it over and get those coins! Good luck!