Licensed developers use the official Dev Kits (development tools from Nintendo) when as the DS homebrew software is typically made and used on DS via third-party rewritable game cartridges like R4DS, SuperCard DStwo and AceKard and microSD card. Nintendo DS Homebrew essencialy is 3rd party unofficial software 'home made' for the NDS by hobbyist programmers, as opposed to official Nintendo licensed software produced by a game development companies and corporation.
