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Had to take some serious creative liberties for this since Unown is so fucking shit (see first line), so I hope you'll excuse me. Some back story:
The player finds the Key Item "Babel Sphere" in some dungeon related to the Unown. It increases the base stats of all Unowns by +5 for each form of Unown that has been caught, to total +140 (see second line).
When they're all documented, you can take the Babel Sphere back to the dungeon and use it to find the Unownite, which allows any Unown to Mega Evolve into Mega Unown (see third line).
It's by no means Uber (or OU, I suspect) but it should at least be viable now. I'm iffy on whether or not the Babel Sphere should affect the HP stat though. Thoughts?