Not sure if anyone has found this yet, but I was able to use

I think I found a new duplication glitch

Lizard Duplication

Even Easier Duplication Glitch

I have no idea how did that and whether that’s useful or not,

Doing the item duplication glitch at Nintendo store NYC

Zonai Device Duplication Glitch (Press B+Y)

What Just Happened? Accidental Item Dupe...

My son was messing with the item duplication glitch and accidentally

If you ever drop an item over the edge.. I'm bad at remembering

POV: ppl at Nintendo after they discover that the total community

Weapon Duplication Glitch