I think I speak for many when I say the Unown were and are a colossal disappointment.
Unown could be handled so differently and it would make their concept wildly more profound. Make an evolution called
Nown (phonetically like noun), that evolves from one Unown upon level up in the party, when three others are also in the party. Would clear up a lot of space in the PC, your roster, you still see their shapes, and now we get an evolution from something that is otherwise virtually useless. It even had it's signature moves' BP reduced this gen! The evolution should be Psychic/Dark, and a BST of 600. That would give it a crippling 4x Bug weakness, a Fairy weakness, essentially Malamar. BUT give it access to all move tutor moves and TMs in the game (sans Draco Meteor, Blast Burn, Pledges, etc.). It would be a more vulnerable Mew, specialized and with a touch of Deoxys to it.
Species would be the Forgotten Pokémon, based upon first languages. And I suggest 3 forme variations based upon the type of Unown that evolves; an offensive forme if the Unown is a vowel, a defensive forme if the Unown is a consonant, and a speed forme if the Unown is a ! or ? symbol. Attack forme would have Sheer Force as it's ability, Defense forme would have Unaware, and the Speed Forme would get a new ability called
Quick Launch. This ability would allow multi-turn moves to work instantly, but @ a 25% reduction in power. So a Hyper Beam would be 113 base power as opposed to 150. Bounce, Solarbeam, Skull Bash, etc. are all still there.