Hi Im very new to the gym and wanted to take my pokemon collection to the next level. I see on the gym, alot of people trading sleeves and deckboxes. Such as gold pikachu sleeves Shaymin Sleeves and Lugia Deckboxes to name a few. What are these? how did you originaly get them?How collectabe are they? Do certain ones go toghether to make sets? As I said this is probobly a Newbish question but if someone could help me understand that'd be great! THANKS!