Well.. I am pretty sure of:
No asking questions you know the answer to then answer them and give yourself BA/Ask a question you know the answer too on a duplicate account then answering and giving yourself BA
No loop holing the rules: Like.. TALKINg LIkE THIs oN ThE CHaT, or Swearing on the chat and Censoring just one letter.
No choosing BA for an answer just because he/she has more/less points than the other answerer.
Down/up-voting for personal reasons like: I hate that Guy/Girl I will down vote them, or I like that Guy/Girl I will upvote them.
Asking obvious questions like is Electro-ball an electric type move?
And insulting Pokemaster or else you will spontaneously combust (O.O)
When giving best answer, you should give it to the first one who answered and answered correctly and well. Don't just give it to someone who tries to spice up their answer with useless information though. And don't give useless information yourself.