Stick RPG Complete
Stick RPG 2
A skateboard can be acquired from the kid in the third area by giving him an XXX DVD which can be acquired from the XXX video store. You must first either get a fake ID or a legit ID from the police station to get the video. An alternate way to get it is to buy it for $325 from the pro skater store. You can also do tricks by pressing the K or O key.
Three skateboards are available to the protagonist: