My brother is getting a Pokemon Pikachu 2 online from this guy in return for something else. I know you guys are probably wondering what a Pokemon Pikachu is.
The spoiler below shows a picture of a Pokemon Pikachu.
A Pokemon Pikachu is like a virtual pet featuring Pikachu. You can use it as a pedometer. If you shake the Pokemon Pikachu by walking/running/whatever, you gain watts. You can use watts to buy friendship which makes your Pikachu happier. You can also use this for Mystery gift with G/S/C. I don't really know how it works but it works. There may be a new version called the PokeWalker which will be made for HeartGold/SoulSilver. Pokemon Pikachus are very rare (that's what I heard) and on Ebay, a useable one is about $60 in US money. If you are interested, then buy HG/SS because the PokeWalker will be bundled with it. The PokeWalker will be a bit different however.
I tried to add links but my laptop won't let me for some reason..The spoiler below shows pictures of the PokeWalker.