The developer says the ROM should be compatible with real hardware and flashcards. The ROM output is a standard .nds file, so it should work with any flashcard that supports homebrew (like an R4, Supercard DSTWO, or Acekard).
C3RV1/UndertaleNDS: Undertale port for Nintendo ... - GitHub undertale ds rom better download
Playing Undertale on an actual Nintendo DS, DS Lite, or DSi is the ultimate goal for many. This requires a —a special cartridge that lets you load ROMs from a microSD card. The developer says the ROM should be compatible
Note: For the best results using this method on a computer, developers highly recommend using the melonDS Emulator rather than older emulators like DeSmuME, as it handles the CPU, audio, and performance much better. The Better Alternatives: Portable Undertale - GitHub Playing Undertale on an actual Nintendo
C3RV1/UndertaleNDS: Undertale port for Nintendo ... - GitHub
Fill out the form to set up an appointment with one of our property management experts.