>>54148262I'd make a sidequest with them where you're trying to decipher a Rosetta Stone-esque item called the Babel Sphere.
Every time you catch a new form of Unown, any Unown that holds it gains +1 in every stat, capping out at +28 across the board.
When the Babel Sphere is fully deciphered, it functions like a Mega Stone, allowing Unown's Hidden Power to hit super effectively against any type combination regardless of what type the move itself is.