The Sinnoh Unown ruins. After catching 26 of them you can go to the 2nd floor to catch the ? and ! ones. The 2nd room also leads to a door, which, on the other side, has a Rare Candy item.

Each floor and each room contains different Unown. On some, it is possible to find all Unown (A-Z). On other floors, the Unown found are different from room to room and on some floors the beginning letter of the item found on that floor. For example, if someone were to find a Water Stone in a rock on a floor in the Solaceon Ruins, the Unown found on that floor would only be the "W" ones.

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