There are two types of rom stripping:

00/FF removal, I suggest GBATA for this (rename the ds rom with .gba extension)
http://www.gbadat.altervista.org/tools.htm

The fun method, removal/replacement of sound files, video files etc. There are a few ways to accomplish this so there is a guide: http://www.sosuke.com/ezflash/viewtopic.php?t=457

 

don't do that. just use DS-X Manager

http://forums.ds-xtreme.com/showthread.php?t=1050

 

yes, i wrote it.
and that alone should be enough