I got a used game of HG and the person before me's profile had all the kinds of Unowns in a box. But they were all shiny. Is it possibe to get a shiny Unown, in the wild? If so, how did this person get all the Unowns shiny?! The time he played wasn't very much. Also, he had a bunch of ledgendarys and everything, but besides the Unown there were just a shiny Pidgey, normal Farfetch'd and a normal Hoppip. Isn't that weird?
Still the standard 1/8192. It's possible to get Shiny Unown.
He hacked, obviously. Or traded, which is unlikely.