List of known Pokemon Leagues

The Fight Club V. 348
www.gamefaqs.com/boards/2000457-pokemon-x-y-battling/68602093

GameFAQs official Gym V.6
www.gamefaqs.com/boards/2000457-pokemon-x-y-battling/68534699


Pokemon Battle Lounge v.30
www.gamefaqs.com/boards/2000457-pokemon-x-y-battling/68214934

GameFaqs' MGM League!
www.gamefaqs.com/boards/2000457-pokemon-x-y-battling/68610359


Know about one we don't go ahead and post it in a response to this.

If you'd like to advertise you're league here go ahead and create a new thread!