Just let me know what direction you’d like to go.
If you're interested in playing Undertale on a DS (which would require a DS emulator on a computer or mobile device), you should know: undertale ds rom better download
If you’ve ever dreamed of dodging "friendliness pellets" on the dual screens of your childhood Nintendo DS, you aren't alone. While Toby Fox never officially brought the Underground to the DS, the homebrew community has spent years trying to bridge that gap. Just let me know what direction you’d like to go
If you have a or a modern retro handheld, you have significantly better options: If you have a or a modern retro
: Download Undertale on your PC via Steam or GOG. Locate the file in the game's installation folder. Patch the File Download the latest patch files from the C3RV1 GitHub releases Run the provided patcher.exe or script, select your file, and it will generate the file for you. Transfer to Console
C3RV1/UndertaleNDS: Undertale port for Nintendo ... - GitHub
If you have a Nintendo 3DS, this project is often considered "better" because it is a more faithful port of the original PC game rather than a demake.