Lanayru Province Upper Zora’s River, you can find this wildstone first time after completing Dungeon 2: Goron Mines (After thawing Zoras).
Spirit Wolf will spawn at Ordona Province Ordon Woods (Ordon Spring), you can find this spirit wolf first time after dungeon 1: Forest Temple (After taming Epona).
Eldin Province Death Mountain (Trail), you can find this wildsotne first time after completing Dungeon 1: “Forest Temple”.
Below we have list all the detail of locations of both Windstones and Spirit Wolves. There are total 6 hidden skills, once you learn the Ending Blow from the first Spirit Wolf, find and activate each Windstone in Hyrule by howling its tune in wolf form.