I'm just so curious and I haven't succefuly caught or want to catch an unknown 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).
Unknown is a special pokemon that can not breed even with ditto and the baby unknown (if there could be one) would be different because its stats,nature,and overall attitude would be different causing it to be different the only way to get a baby ditto would be the instant egg cheat with those two in day care why you would want a baby unknown is well unknown because you can find millions of them in that cave on diamond and pearl so breeding one would be kind of dumb but you have your reasons sorry its so long bye
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