kingdomhearts.wikia.com
You find all your answers for Kingdom Hearts on "wiki Kingdom Hearts"
Youtube would be the best guess. It has millions of videos. Another option would be to find the official website for Kingdom Hearts 2.
I always go to my favorite manga-scan website, OneManga.(com).
Kingdom Hearts- Air Pirate, Battleship, Pirate Kingdom Hearts II- Aerial Knocker, Shaman.
There are no Gameshark codes for Kingdom Hearts 2.
I would go to http://kingdomhearts.wikia.com/wiki/Kingdom_Hearts_Wiki and when on the website, on the left side of the page, role over Main Games and then click on Kingdom Hearts II. The website also gives you info on all the other games and so far has been a really reliable website, so you should be able to find out what Kingdom Hearts II is about, plus all the other games. :)
Hot Topic, You can go on-line at hottopic.com and search kingdom hearts and there's a kingdom hearts necklaces and other things.
You have to earn them.
There is no possible way of finding Xemnas in kingdom hearts. You are only able of finding him in kingdom hearts 2, which he is the last boss in the game.
You can find Kingdom Hearts in: * Gamestop * Wal-Mart * Best Buy Hope this helps! =)
Kingdom Hearts backpacks, shirts, and other accessories are available at Hot Topic.
There are many places one might go to find the lyrics for songs performed by the Kingdom Hearts Music. In addition to the official musicians website, one might also try the AZ lyrics website.