I discovered this Yesterday on December 28 2020.

The first video is the clip being performed in a quick fashion. The second video is a short lesson on how to perform it.

Variables: I was playing with the physical 3DS game cartridge on a NTSC New Nintendo 2DS XL.

IMMPORTANT: This trick has only been done on the 3ds game cartridge. Other versions of the game have been tested and it seems that they can't perform this trick.