https://youtu.be/XO0ilQCFRdI
If anyone wants to become rich overnight the above video shows how to duplicate all items. The expensive bug farming trick only ever worked once for me but this one works. I now have unlimited gold stones and I've made more money in last 2 hours than I did in my first one month of playing the game. Of course Nintendo will kill this bug in the next update but I am going to enjoy it to the fullest while it lasts.