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Odd Keystone
A vital Item that is needed to keep a stone tower from collapsing. voices can be heard from it occasionally.
Pass Orb
A mysterious orb containing the power of the Unova region. to be used when generating pass power.
So it looks like there's a bunch of Unova items now.
Also looks like the relic items are from there as well. Never played that gen. Guess they either left the stuff in the coding or they plan on using it again.