Speak with Gorrik in Sun’s Refuge, now interact with Home Base (Play Hide-and-Seek), you will have to find your skyscale now, its location will blink with a red dot on the map after some time to help you find its location.
You will have to do this 3 times, 1x easy (Stealthy Apprentice), 1x medium (Stealthy Journeyman) and 1x hard (Stealthy Master).
Locations are random, all possible locations are shown below.
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Rewards:
Skyscale Stealth
1 AP
Continue with Skyscale Reflexes.