The easiest and most common way you can become a PC supporter is by donating some money to help keep the servers running (you can learn more about it in this thread). Occasionally there may be competitions during PokeCommunity Get-Together were supporter-ship is a prize but obviously there are a limited number of people who will win it. Those are the two ways you can become a supported so I hope that helps :P
Your thread wasn't accepted because it didn't really have an introduction. Your introduction should be about a paragraph long and expand on why you want to make a hack, the level of skills you want members to have and things like that. Have a look at other approved threads to get an idea of what should be included in your introduction.