Not the exact Happy Fun Rock, but they make me happy.. Flawless Pet Battle Stones!
Whilst doing my circuit of pet battling dailies in Pandaria, I received a second Flawless Magic Pet Battle Stone from Wastewalker Shu in the Dread Wastes, the same trainer I had got my previous magic stone from. It got me thinking if certain trainers have higher % chances of giving certain pet family stones from the bags you get from the dailies, or if its just a random coincidence that it was the same trainer who gave me the same stone. Probably the second option, but I'm going to test the theory out regardless, many pet battles to come!
Off to pet battle some more, will hopefully have some luck with more stones!