Unown aren't that bad.

The ruins and Unown in the second generation were quite important to the game, in a sense, in that placing them there contributed towards making a universe rather than some convenient stops for battles and storyline, and they sort of anchored things through being a location which at the same time did have further significance through certain moves and so on which called back to the Unown, such as Sketch or Curse, which was in some ways akin to Hidden Power as something which was primarily for ghost types but could be used by others. Their only move being Hidden Power contributed in some respects to what made them interesting, the original sequence wouldn't have worked if they were marketed towards being used in competition and so on by competitors, and it's probably important that they come off as something more fundamental to the game itself and as words and so on instead of just another Pokémon used for battle, so that you'd probably have to be quite cautious about evolutions or moves, which would have to be given for reasons which fit the Pokémon thematically rather than to make it less effective, given that it could have any effect that the designers wanted it to without necessarily giving it attacks in any case.

Shiny_Unown said:

There's one thing I noticed though. That Unown have been said to become more powerful or unlock more abilities if there are multiple (in specific pokédex entries). Does that mean that there full potential unlocks if we have a full party of Unown in our pack?

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That isn't implemented in terms of stats, etc., nonetheless it's possible that there's something quite fundamental to it, given that it's mentioned or hinted at from time to time, although perhaps out-of-battle, or in areas of the battle system which people don't tend to focus on. Likewise, given that Unown can be captured only through unleashing different types of Unown from different locations and such rather than all at once, it is possible that the game recognizes certain patterns of Unown with specific abilities as suggested, although given that they didn't even choose to let the fish-shaped Unown learn Splash at some point, it's not entirely obvious what kinds of things a person could for example spell out with around or exactly the party of Unown which was suggested. I mean the researchers do have to be researching something, what most people notice about the Unown is basically given away by the name of the ruins.

What is generally said about this consistently is that Unown communicate telepathically, which might rule out some stats changes, and that multiple Unown have the ability to comprehensively Change reality and such, as well as different kinds of Unown having their own, distinct powers, so there might be something unique about the Unown in their original habitat other than having 26 or so forms with 1 attack each, which isn't unique in itself independent of its meaning. In any case, Unown does seem quite suited to the larger scale of the second gen., and helps to tie it together somewhat, and hence given that that was a pretty good generation as Pokémon goes, and notable in terms of effort and scale of the idea, it's likely that Unown has some significance by itself which might at some point be unveiled. So, basically, as it is it's either an interesting or Very Great Ho-oh or a worse Beedrilll.