We follow all Smogon competition rules.
You can find the rules here: http://www.smogon.com/bw/banlist/
We follow the OU clause, meaning that Ubers are banned, and you cannot have a pokemon with drizzle and another with swift swim on the same team.
Ubers (our banned list) can be found here: http://www.smogon.com/bw/tiers/uber
Gym leaders must have at least four (4) Pokémon of their selected type, plus two (2) "wild cards". Wild cards can be any Pokémon not currently banned.
Members ofthe Elite Four must have atleast three (3) Pokémon of their selected type, plus three (3) wild cards. Same rules for wild cards apply.
Challengers of the Pokémon League must battle and defeat each gym leader, earning a "badge."
Granted, you do not get a physical badge, so you must find the leader's topic under "Gym Leaders", and post that you beat them, along with the score. (I.E., 1-0 or 3-0)
For members of the Elite Four, after you defeat them, you must then dothe same basic thing in the forums you did for the gym leaders.
Once there is a champion, challengers must then defeat him/her as well. Make sure you tell a site admin thatyou defeated the champion, and your name will be added to the spot.
Gym Leaders and Elite four are allowed to battle with Single, Double, Tripples and Rotations.
Frontier Brains will be typeless and there will be different kinds of styles they'll be using. The style will be: Baby cup, Double, Single, Triple, Rotations, lvl 50s (+/- depending what level they want it). And if you defeat him/her, they'll give you an Symbol or some sort when you defeat them. But I'm telling you, they won't be easy because we'll carefully choose our Frontier brains.