It's been a while, but I'm starting to take signups for the next ION Rumble. Like stated before, this will be a rumble based off of Pokemon X&Y's sky battle rules (I'm still bitter that they didn't do more with this metagame...grumble). This format restricts you from using certain moves, as well as limiting your team makeup to mostly Pokemon that either have Levitate or are of the flying type (note: not all flyers/levitators are permitted, check the link at the end of this post for a more detailed list of what is and isn't permitted.
This tournament will use Single battle rules, and will follow all of the standard ION clauses (evasion, sleep, no ubers, etc.) with the additional restrictions that sky battles have. I'm planning on having this tournament start up next Friday the 29th of April. I know that the restrictions of this might mean people need more time to prepare teams for this, so please let me know if this tournament interests you, even if you feel a week isn't enough time to prepare (if enough people feel this way, I will extend the signup period).
Wikipedia page that describes the rules of Sky Battles in detail: http://bulbapedia.bulbagarden.net/wiki/Sky_Battle