Dewy is the Harvest Sprite of water. He lives at the Harvest Goddess Spring once awakened after the third Skytree is revived. Talk to him to have him assist in watering crops
There is no gift-giving in Skytree Village. The only way to build chemistry is to talk to the villagers every day. Unlike previous games, chemistry will not decrease if you do not talk to someone for awhile.
Dewy can be found in the harvest spring from 8am to 8pm after being unlocked.