If there were a biome for Unown it should be the place in Mainz Germany where printing with movable letters was invented. But it isn't, I often walk past the spot of Gutenberg's workshop and never saw one there.
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If it were anything like Pokemon Gold/Silver, it should be around historical museums and ancient ruins. Especially places with cave art or pictographs.
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There is lots of this stuff here near Gutenberg's workshop, since it's close to the place where the river Main flows into the Rhine and is probably a settlement since walking on the hind legs was invented. Nothing, no Unowns here.
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I think this sort of information is unown sorry
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Saw it once in a gym , so now have it on seen that is something ..... I guess
Other than that never saw it on sighting , near by
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Perfect target for an event...
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South SF Bay Area has been getting them really regularly. It's a desert biome with some electric. I haven't found one cause I don't want to use trackers but I hear about people going to grab them every couple of days.
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Ive caught 3 in NYC.
Its basically a electric/ Water biome
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Since Unown is more exceptionally rare than any other pokemon, I think it would be unfair if he had a biome. So he's probably equally rare everywhere, but of course more likely to spawn in places with more spawn points (cities).