Alright, I decided to get back into FF3 (NES) and get myself some Onion Equipment. Though it hasn't been going well at all, seeing how I can't get the trick in this guide to work to my liking (though I have successfully but unintentionally converted 60 Leather Caps into 60 Onion Helms). I've also gotten 396 Kaiser Claws unintentionally, 297 of which I sold. Besides the Onion Helm conversion (where my item list was full), every time I've done the trick with an empty spot, the closest empty spot gets 99 Kaiser Claws and every time the item list is full, nothing happens when I get multiple potions from the same battle. I know it says that I only need to get a single potion when I have 99 potions, but getting multiple potions from one battle when I already have 99 potions is the only way I can get items to upgrade.
So my question is: has anyone successfully used this trick and can help me out with it? If there isn't anyone that has, does anyone know which floors in the Sylx Tower have the best chance of encountering Green, Yellow, and Red Dragons?