1. Pick a type that isn't in the Gym Leader or E4 section yet and build a monotype team with max. 1 off type. (2 is allowed but then you need to preview your team in the gym post)
2. Post in the gym leader tryout section.
3. Ask Arieon or me for a test battle.
4. We decide if you'll get the gym.
Good luck!
P.S. E4 is currently Dragon, Psychic, Flying, empty