You could just have guild leaders control guild hall permissions. They'll have a list of members and they can toggle permissions for members, like ability to enter gym, ability to use the Guild PC, ability to decorate (if decorating is added), etc. Add a toggle for Public/Private. In Private Mode (default), no one can enter except members who are allowed and anyone the leader adds to a guest list; public lets anyone in. Player walks to the door, it displays a list of all the gyms they can enter, with their guild gym at the top for simplicity. Here's an idea: we could replace the Net Center on One Island (it was used to link up with Sapphire and Ruby or something, but is worthless now) and turn it into our empty player gym. It already looks kind of like a Gym. I also feel there should be a certain member count before you are allowed to have a gym.