Below are the rules in the rule page.
Chat is more relaxed and informal so lowercase and shorthand is fine
here, as long as it's understandable.
Respect others' opinions: Debating is fine, but everyone's different
and likes different things.
Don't post personal information: This includes email addresses, real
addresses, phone numbers or other personally-identifiable information.
(Vague locations like countries/states/cities are fine.) Remember, the
chat room is essentially a public forum that anyone can access. In addition, please avoid posting pictures of your personal self.
Don't get mad if no one responds: If you are looking for
trades/battles, then usually people will simply not reply if they
don't want to trade/battle, rather than everyone saying no.
Don't spam: Don't post junk comments/spam; this includes posting the
same thing over and over.
Simple, right? Apparently not.
Nuberator and NotANinja have brought you a guide. Follow it.