While I was curious to what might happen if I actually caught all Unown, and did make it a point to try and catch all forms of it, I never actually managed to. I'm kinda glad I didn't either, because as A Bleu Sylveon mentioned, the reward for it was less than anything satisfying. Unless you're a collector, I don't really see a point in catching them all just to get two more forms of it, and you would end up catching all of them anyway, so it wouldn't make much of a difference :p So yeah, feel like it was a bit of a cop-out reward, but at least there is a reward! I did like to speculate what would happen if I did catch all of them though, but alas, the truth turned out to be quite a bit more disappointing than anything I'd imagined haha.