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.
I'm on a mac, and when I download the pokemon online client file and try to open the .dmg, I'm told that it is not supported on this architecture. Can anybody help me? I'm running Mac OS X version 10.5.8