Anniversary Hood
From Pixelmon Wiki
The Anniversary Hood is a special Cosmetic that can be worn in-game. Wearing this requires your Discord and Forum Accounts to be linked, and is only available to those with the 10th Anniversary role in the official Pixelmon Discord server.
The Hood can be activated by typing /redeem gui
and selecting the Anniversary Hood
from under the Hat List.
If you are unable to see the Hood available in the list, type /redeem
to refresh your Cosmetics and check again.