Use APKPure App
Get Gym Tracker for Pokemon Go (Unreleased) old version APK for Android
Stay up-to-date with your local Pokemon Gyms with Push Notifications
This app allows you to track the status of gyms in your area for Pokemon GO.
You will need to physically be near the gym you want to add. All gyms added are visible to anyone else using the app.
I am not affiliated with Pokemon GO or Niantic. Those companies retain all rights to any content they own. I built this application because I love the game and love coding.