Is there a high speed processing cheat for Diamond/Pearl...

what the hell do you mean?

oh and dont bumb ur own topics the residents here dont really approve. you dont need to worry about it not being answered it will get a response within a 24 hour time frame

 

in HG/SS there's a cheat where everything speeds up.

to answer the question, there isn't.

 

oh i feel like an idiot now especially since when i was playing that game i had it on all da time

 

There is?

 

Nit everything, but most things. It removes the framerate limit to stuff that doesn't push the DS to it's limits (like the menu and non-overworld stuff) runs a lot faster.

It's in the cheat database.
http://cheats.gbatemp.net/