Spiritomb Wisps

As part of Request 22, Eerie Apparitions in the Night, you are tasked to find 107 wisps that are located around the Hisui Region. These wisps are the make up of souls taken by Spiritomb and you've been asked to return them to the Odd Keystone in order to seal Spiritomb away again.

These wisps are generally quite visible, especially in night, but can be found in some unusual places. For every 10 Wisps obtained, you will get a special reward from Vessa

After you have collected all 107 Spirits, go see Vessa at the Shrouded Ruins in the Crimson Mirelands and make sure it is night. Vessa will say she has the final spirit and to put it in the Keystone but first asks what you think of her. She asks for you to close your eyes, and when you open them she will be gone but the final spirit will be in front of Spiritomb. Get it and the Odd Keystone will start glowing and then vanish.

When you approach the Keystone, you'll get targeted down and Spiritomb will appear at Level 60

After you have caught Spiritomb from the wisps, it will start to appear in the Shrouded Ruins at night at a very rare chance. This allows for you to get the Spiritomb as an Alpha or as Shiny