Lucky Egg accidentally got sold in Pokemon sun?

Question

I got the lucky egg from Professor Kukui, and my friend sold it without me looking in Pokemon Sun. Is there any way to get that egg back?

Answer 1

Sort of. It is only possible if you have USUM, because only wild Blisseys can sometimes hold Lucky Eggs. You will have to encounter Chansey and SOS call chain it to get a Blissey, which further only had a 5% chance of having a Lucky Egg. You can use a move like Switcheroo or Thief to steal the Lucky Egg, or you can try to catch Blissey. Once again, this is only possible in Ultra Sun and Ultra Moon, so once you get a Lucky Egg, you can trade it over to Sun and Moon.

Source: https://www.serebii.net/itemdex/luckyegg.shtml#wild

Answer 2

Unfortunately there is no other way to obtain the Lucky Egg in Sun and Moon. Happiny and Chansey always used to have a small chance of holding the Lucky Egg upon spawning, but this is not the case in Sun and Moon. Sorry.

Hope I helped. :)
Source: http://www.serebii.net/itemdex/luckyegg.shtml