If youve misplaced these instructions then tell us exactly which game and exactly which patch you have.

Xdelta- used by many hackers around here (pretty much as that was what the earlier DS hackers settled upon).

No official extension but delta or xdelta or something along those lines is most common (read the patch NFOrelease notesreadme and it should tell you).

BSDiff- used more commonly by members of the scene proper for trainer patches but used by a few translation hackers as well.

In the larger world of patches BSDiff and xdelta are rivals of a sort although frankly for rom hacking purposes they are as good as each other (they both tend to produce patches small enough for distribution that are fast and do the job).

Batch- DS roms are made of files so some hacks deconstruct the rom, patch the files themselves and rebuild the rom (can make for smaller files than the previously mentioned methods).

DPS- basically a customised batch file and patching method made by deufeufeu for his Jump Ultimate Stars patch.

After this people tend to make their own patching executables or formats (PDS being an example) with the custom patchers you can find.

There are a few more frontends around as well if you fancy searching but those on the link should have you covered.

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Violated Heroine English Patch