To achieve the dream, you need three things: a hacked 3DS (via Luma3DS custom firmware), a copy of the US or EU version of SMT IV:A, and the undub patch itself.

(movie) folders with those from the patch, and then repacking it. extracting and rebuilding a standalone undub file for use on your SD card? [3DS] Shin Megami Tensei IV Undub patch by Canzah & Slow