what genderless pokemon can breed?
>The Gender unknown Egg group is characterized by its members' lack of a gender. All members of this Egg group are genderless yet are able to breed, but only with Ditto.
Source: Bulbapedia/ Gender Unknown
All genderless Pokemon breed with Ditto ONLY. Except of course, Legendaries.
Any pokemon can breed except the ones here. All you need is a ditto.
All of them, except Legendaries.
You need Ditto.