When I click Lightweight Egg (item ID 158436), it gives me the option to delete, feed to one of my pets, or use on one of my pets. I can't put it into a shop, donate, put into my vault, etc. The delete option is on the same line as the option to feed it to my first pet. I also tried to use quickstock but it doesn't even appear on the list.

Thank you! :)

You're not supposed to be able to move it into a shop/vault/etc. or quickstock it. It's not a tradeable item.

Oh! I'd never seen it before. Got it as a prize from a battle quest today. Thank you !

Locking as resolved :D