What happens when you breed ditto with ditto?

Question

Would you just get another ditto,get a random pokmon,or would they not breed anything at all?

Answer 1

Ditto will not usually breed with another ditto to make a ditto. The only possible way to get them to breed breedwith each other is in generation II (gold, silver, crystal). By the way, if you breed a ditto or any other Pokemon in generation II, it will be level 5. I hope this helps! %]

Answer 2

Nothing. No Egg would appear n the daycare.

It can breed with any Pokémon other than the Pokémon in the Undiscovered group and itself, including male Pokémon and some genderless Pokémon, to produce Eggs of the other's species.

Source:
Bulpapedia, and Personal Experience.