By Pressing a button, increase the speed of the game?

What I want it to do is increase the speed of the game when holding down a button. It was done in Pokemon Raptor EX but I have a hutch that they used the running speed for it.

I remember seeing a script like that posted somewhere here. I don't remember what topic, or which section, but if you look around a bit I'm sure you will find it.
I wish I could give you link, but I have no idea where I saw it.

EDIT
Actually, here I found it.
http://www.pokecommunity.com/showthread.php?t=276213
http://www.pokecommunity.com/www.pokecommunity.com/showthread.php?t=276213