If they had an Omnitrix, these characteristics would be adapted to the Aliens, as didn't happen in "Side Effects", where Ben got a cold and the aliens also got a cold, or wouldn't the Omnitrix do that?

I made an edit with Heatblast and Stinkfly to illustrate.

E... Caraca! O Reginaldo Primo voltou ??!?! Nunca pensei que ele iria voltar pro Shadow!