The Mysterious Will-o-the-Wisp is a side quest (request 20) in Pokemon Legends: Arceus tasks you with investigating a mysterious creature that has frightened a villager as she was travelling along the Windswept run. You will need to travel here and try to solve the mystery of what is going on and what is causing the light, high up in the trees.
How to Make The Will-o-the-Wisp Appear
When arriving at the Windswept run, you might notice that there doesn’t seem to be any evidence of a glow coming from the trees, as you run up and down the path, there are plenty of Pokemon, but nothing that glows. Even if you visit at night time, there is nothing that really stands out. The secret is that it won’t appear until you interact with a specific tree.
When you reach the location marked on the map, you will find a large tree in the middle of the path. If you walk up to this tree, you will see that it is possible to interact with this tree. Doing this will trigger the Mysterious Will-o-the-Wisp source to appear and you will be able to complete the quest.
What Pokemon Is The Mysterious Will-o-the-Wisp?
Spoiler alerts, not that the quest is all that mysterious but spoiler warning all the same.
Once you interact with the tree, you will see that a Chimchar appears at the top of the tree. This will begin a battle against this Pokemon. Once you have completed it, you can return to the village to complete the quest.