Ishokin Shrine can be found on the slopes of Zokassa Ridge, west of Pappetto Grove.
How to Open the Shrine
To open this shrine, go north to where the beam of light is shining, and you find Baddek. He wants to see you ride the giant white horse. Complete Ride the Giant Horse to receive the shrine crystal.
Rauru's Blessing
The chest in Ishokin Shrine contains a Topaz.