Didn't want to double post, to answer your question go here
http://www.pokecommunity.com/showthread.php?t=117917
look for "Palette editing with APE"
There is also this thread doing the same thing without using APE.
http://www.pokecommunity.com/showthread.php?t=200670
Hackmew's post on the second thread has some extra info on the subject.
http://www.pokecommunity.com/showthread.php?t=117917
look for "Palette editing with APE"
There is also this thread doing the same thing without using APE.
http://www.pokecommunity.com/showthread.php?t=200670
Hackmew's post on the second thread has some extra info on the subject.