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I developed the Unown idea in a "how do we fix Unown" thread the other day. Long story short, the player finds a "Rosetta Sphere" in the basement of some dungeon called like "Temple of Babel" or whatever. It boosts the stats of all Unown by 5 points for every form you have caught, to total +140. Then, by completing a related sidequest, you can find the Unownite hidden inside it so you can do the mega evolution. The previous boost remains in effect.