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.
In the future when you have a simple question, try finding the Simple Questions, Simple Answers thread of the format you want information on. For example, I'll bet you're looking for this thread:
Just make a post there. This is the SS OU team forum, where you post a completed SS OU team for rating by others. This is a simple question for VGC. Try moving your question over there, you'll likely get better and more reliable information.
you can reach it by clicking the "forums" button at the top of the page. This'll bring you to the main forums list, and from there you can find most things you are looking for such as the pages for the official smogon tiers such as SS OU, older tiers like ADV UU, official Pokemon battle formats like VGC and Battle Stadium, and pages containing conversations completely unrelated to pokemon