Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
For the nickname part? I said in the rules that you can pick a name for as many pokemon as you would like. Do note the legal character set that is available in XD though. I edited in a pic in the first post.
My friends Shiny Kyogre is Hasty. He wants 4 credits for it, because he'll look through your thread on my account. Its 5th Gen so he'll need to get it cloned by someone.