R4CCE is just a cheat editor. It uses the R4 title because that was originally one of the flashcarts that used the usrcheat.dat file until it gradually spread to the more popular flashcarts. As for making cheats, you might want to check out the cheat.gbatemp forums and I believe there is a thread on how to make your own cheats (the simpler ones anyways, stuff that you can find using the freecheat on the DSTWO...for the more complex cheats...well those require a lot more knowledge).