OK here is a serious answer, as right now you have trachy's funny answer.
To make friends on this site have a good sense of humour (like trachy XD)
Follow the rules.
Do not swear, yell, insult, or bully.
Be nice to people.
Do not talk about controversial issues (trust me I know from experience it makes more enemies than friends on the chat, there are better places to discuss them)
Be a good battler.
Do not, under ANY circumstances, EVER, brag about how good you are at Pokemon battling, this will just lead to one of us thoroughly kicking you butt in a battle and you crawling into a hole of shame. (We have had many noobs claim to be awesome at battling because they beat the Elite 4, just like every other 6 yr old with a D.S.)
Do not argue with older users who try to help you understand the rules better.
Other than that it depends on your personality, some people make friends faster than others. Do not give up though, try your best :D