It's easy. One person posts the name of ANY Pokemon city or town, which has a gym leader. The next poster responds with the name of the corresponding Gym Leader and posts another Pokemon city or town.
****You may also post the name of a Pokemon city, town, etc. which does NOT have a corresponding gym leader. The nest poster would acknowledge the fact that that Pokemon city or town does not have a gym leader.******
Silphy, you are just a young Silphy. From some planet in some other galaxy. You will be the cause of the inevitable alien invasion. The other Silphies will be here looking for their lost Silphy. But this is your home now. And you are our one and only Silphy.