Here you can find the URPG's Elite 4, Gym Leaders, and more. If you're interested in applying for an open gym, you may do so in the Apply for a Gym!
Gym Leaders in the URPG award a badge, TM, and extra money for defeating them. They are only allowed to use Pokemon in their lineup, found in this thread, although they may choose to edit their lineup, with the approval of his/her League Organizer. Most gyms are limited to using only one type of Pokemon; however, many are able to use one (or two in the case of Dragon gyms) wildcard Pokemon, often related to the type. Wildcard Pokemon must still exist in a Gym Leader's lineup. Gym Leaders are able to set the rules of their gym battles, as long as the rule is a legal rule
. However, the battle must be higher than 1 VS. 1. If the battle mode involves sending Pokemon and moves in the chat/thread instead of privately, the leader can decide who sends his/her Pokemon first. Some leaders have specific rules they must use. Those gyms and their rules will be specified.
It is the League Organizer's responsibility to be in charge of their league and making sure their Gym Leaders are active.
A trainer may challenge a Gym Leader for his/her Gym Leader position if the trainer believes he/she can better defend the gym. However, the challenge must be approved by the League Organizer, who will decide the specifics of the challenge.