Like, Sleep Clause. I hear them a lot, but haven't go a clue on what they mean.
"A Clause is a restriction placed on the options battlers have other than a simple Pokémon ban. They may prevent certain teams from entering the battle or outlaw choices in battle depending on the situation" (taken from the link below).The clauses applied change with what tier you are battling in, and different tournaments. All the clauses are listed here: http://wiki.pokemon-online.eu/view/Clause
How to change your username
How to add a user avatar
Why was my post hidden?
The points system
Flags vs Downvotes
Type a Pokemon name, type, move or ability to see instant results.