Ok, I fight the Jade Oni at least five times a day, and I have been doing this for about two months and he has never dropped that pet. I think it might be a "retired drop". On the other hand, when Pat O' Gold is in the Shopping District, the Jade Oni CAN drop a Lucky Leprechaun. :-D I still havent proven that he DOESN'T drop the Jade Oni pet, but I have never heard of him dropping it for a while. Hope this helps, Malistaire's daughter, Donna Ravenheart, (Level 52 Myth).