I'm just so curious and I haven't succefuly caught or want to catch an Unown on SS because they're all on diamond.
No,Unown can't breed because it's in the "No Egg" group. and the shape of the Unown depends on it's IVs,so since hatched Pokemon's IVs are different than it's parents',the Unown hatched would be different (if it did breed).
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