If you're having a difficult time beating the pros in the game in a game of SKATE, try the following. Since the pro always goes first when you challenge them, keep resetting your game until the pro messes up his first trick.
At this point, you can break out some difficult tricks that will allow you to beat the pros each and everytime. Do a 540 spin in variations (Ollie 540s, Nollie 540s, Kickflips, Heelflips, et cetera). Doing this will defeat your opponents easily because they won't even attempt to repeat the hard trick you just did. Easy victory!
To unlock the special Best Buy clothing, type the following code in at the main menu: up, down, left, right, X, right bumper, Y, left bumper.
There's an unlockable skate park in the game called Danny Way's Mega Park. To unlock it, you must advance through all video and photo shoots that are relevant to achieving full sponsorship. Full sponsorship entails board, truck, and wheel sponsorship.
After you achieve full sponsorship status, you will receive an invitation to Danny Way's Mega Park. You'll need to compete there - and win - in order for it to be fully unlocked to use at any time. (unverified)
You can unlock a hidden character called Dem Bones by breaking each bone in your current character's body three times. Check the injury log to peek at your progress.
To unlock the Plan B Warehouse, beat Ryan Gallant's pro challenge.