To create a shortcut that launches Mario & Luigi: Partners in Time directly from your 3DS dashboard, you need a custom-firmware (CFW) modified 3DS running Luma3DS.
Use the homebrew application on your 3DS to select the ROM and automatically place an icon on your home menu. Step-by-Step Installation Guide via FBI mario and luigi partners in time 3ds cia
If you're exploring the world of 3DS homebrew, you’ve likely seen the term CIA (CTR Importable Archive) Native Integration To create a shortcut that launches Mario &