No 2 dittos are compatable to breed but you can breed with any other pokemon that are not legendary. also manaphys. i hope this will helps you find out.
sources: read the breeding stuff on this site.
theepicME, you are wrong. Not all non-legendary pokemon can breed with ditto.
‘Ditto’ egg group Unsurprisingly, this egg group contains Ditto! Technically this is a real egg group but it's more of a meta-group. Ditto can breed with all pokemon besides itself and the Undiscovered egg group.
taken from the Ditto egg group page.
