Well, this is a video that shows many helpful techniques for all of the characters in Brawl. Techniques such as locks, infinites, grab-releases etc etc. Just click a character when the ssbb roster appears, and it will list all of the AT's for that certain character.
Here it is:
Try performing those several AT's for your mains, and I know they will help you improve your game.
oh yeah, I absolutely take no credit for the video. All credit goes to the person that made it. I just thought I'd show you guys something that will help you all improve your game.