Shiranui was psyched up for his first Grand Trial. His research into Kahuna Hala told him that he specialised in Fighting-type Pokémon. "I'll probably need to stick with Ashika and Ikari as Okami has a type disadvantage and the rest of my party are too powerful," he thought.
"That's a good question," answered Shiranui, "If he's not there, we can find him back at Iki Town" He figured the local Kahuna would know more than anyone else on the island about converting the Sparkling Stones into functional Z-Rings.
With Okami's help, Shiranui made his way back out of the trial site; all the while musing over how he would get his Sparkling Stone converted into a Z-Ring and thinking about doing some research on Z-Moves once he gets to a Pokémon Centre.