A child in Hyrule Castle Town is obsessed with Zols after seeing a picture of one in an encyclopedia.
Where to Start the Quest
After you complete the quest "Still Missing", talk to the child in the west part of Hyrule Castle Town to start the quest.
How to Complete the Quest
Create an echo of a Zol in front of the child. Then create an Ignizol in front of the child. Next, he asks to see a Hydrozol.