Ok, just to clear up some misconceptions.
There are two types of Brain Boys.
One for Red/Blue and maybe Yellow
and one that only works for Gold and Silver
I got the one for Gold and Silver, and, it will not work on crystal, which sucks...
Anyway, here is the offical website for the MonsterBrain G/S one that I have.
It's not a bad device if the only sharking you'll ever do is on Pokémon Gold and Silver only! It has an ok interface to do the hard stuff for you, but, if you want to be a serious hacker and do more than just G/S get a GameShark...
P.S. It has a memory backup thing that works for all games (not just pokemon) that have a saved game, or atleast they should work, in other words, it also acts as a MegaMemoryCard.