In the back of each puzzle room in the ruins of Alph is a word formed by Annons/Unowns. They require you to do things in order to get into a back room. In one place, you must equip a Water Stone. In another, you must put a Houou/Ho-Oh first in your lineup. In another you must use an Escape Rope. In another you must use Flash. Once in the back room, pick up the items and fall down the hole to find a room with a message about Annon/Unown. Fall down the hole there to return to the Annon/Unown shrine.