Same here. You go to this one guy who bitches about something, then choose someone to fly to that island. Put the item you want dupped in a certain spot, i think it was 3rd i dotn remember, then go swin the coast of the island till you run into missingno. Run or kill him , DONT CATCH HIM, hell fuck your game up, and you get massive dupes of that item. I know it worked in pokemon blue but in not sure of any of the other ones. works great for that rare candy