Tuoko
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(again, note that you cannot evolve Cosmoen in Ultra Space at all in Sun and Moon, while Rockruff and the Starters would most likely have already fully evolved by that point anyways).
When you trade a Cosmoem/starter/Rockruff that's ready to level up in order to evolve, they'd still evolve in the evolutions they normally do. It's not impossible for a Cosmoem to evolve in Ultra Space when considering trading.