This is the main battle field. You automatically enter this battle field when you come into the chat. Do not mind the pokemon and people in the second picture. But in the second picture that is how the colosseum looks. To watch the battle you will stand in the balconies which is on the third picture. The balconies are those things with the flags hanging down. Not all of them have them though. As soon as you enter the colosseum you will be transported to a balcony. You will not be able to enter the battle field of the colosseum unless you are getting ready to battle.