I've already posted this in the nearly-identically named thread, but eh, here goes:
The following is a Hp Bar Speed code for Platinum:
12268178 00001C20
12268186 00001C20
12085734 00001C21
It disables the HP bar animations, which makes battles a lot faster. Does anyone have this code for HGSS? Hopefully it'll just be a case of changing the address by an offset, but I don't have a clue about these sorta things.