I do not understand.... I downloaded the DS-Scene thing linked to in this post, but now what? Where is the usr/cheat.dat file? What do I do with what I was given? *flails about in corner of failure*
When you start the DS-Scene Rom Tool, it will ask you to download the latest version of the rom tool, the latest version of the AP database and finally the latest version of the cheats database. Select which version of the cheats database you want in the bottom left, and voilà !