Gyms like all things Pokemon go are gps hot spots. There are three teams red blue and yellow (or valor. Mystic and instinct). An empty gym shows up as gray in the app. Most gyms are taken by now. Each player has to pick a team at level five. The gym I took over was a blue gym. You play your Pokemon against those blue players have left at the gym. I chipped away one win at a time until the gym value of blue goes down to zero. Then I quickly have to put in one of my own Pokemon to claim the gym. Nerd rant over. Some little kid will turn it red or blue by seven am tomorrow.
Hmmm xmen. All I know of xmen is why is Jean luc Picard in a wheelchair? Did the Borg lose funding? Nerd rant really over