PokéBase - Pokémon Q&A
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Nothing will happen. While Ditto are able to breed with almost anything else, they are unable to breed with each other. The daycare helper's response will be "They prefer to play with other Pokemon...", indicating that it is not possible for the pair to generate any eggs.

so does this mean you cant breed a hidden ability ditto
That is correct.  You can get them in the wild in Sun/Moon through SOS Battles, or in X/Y in a Normal type Friend Safari, if the friend providing it is online at the time.