Mani asks you to look for any evidence of an ancient settlement at Avalanche Slopes.
The Request
Go downstairs in Galaxy Hall in Jubilife Village and talk to Mani to accept this request.
Search for Traces
Go to Icepeak Arena in the Alabaster Icelands and go south to the guidance marker. Approach it and you will get a Torn Journal.
Go to the Next Location
Go to the next guidance marker. You will have to battle a level 55 Froslass. You can defeat it or try to catch it. You will get an Old Journal.
Report to Mani
Go back to Jubilife Village, enter Galaxy Hall, and go downstairs to talk to Mani.
Reward
You will get a Dawn Stone.