Do you know about the pokemon monster brain device? (if you want to see a picture of it go to ebay and type in monster brain) Can it do anything bad to you game such as deleting your saved game file or making weird glitches?

No idea, but it sounds like a cheat device, and cheat devices like GameShark and Action Replay can mess up your game information.

The Pokemon Monster Brain device is wicked. Its like a gameshark, but better. You can edit things in the game, like names and stuff. My friend used it on my Silver Version back in the 7th grade. It did mess it up though... I kept running into my rival everywhere, and that guy outside of Violet City kept stopping me telling me I needed to fight Falkner.

Anyway, if you find it for a good price, I suggest you buy it. Its a pretty cool cheating device.