Ball pythons that are known as "co-dominant" are actually incomplete dominants. A pastel is an incomplete dominant gene, and the "complete" version is the super pastel. Same with Mojave, Lesser, Butter, Russo, Special, Etc.

So if you get a female that is the super form of any incomplete dominant, you will have no chance of normals.

A pastel carries one set of pastel genes and one of normal genes.

A super pastel carries two sets of pastel genes.

A pastel can pass on either the pastel or the normal gene to babies.

A super pastel can only pass on a set of pastel genes, thus none of the babies can be normals.

Other options would be leucistic, super cinnamon/black pastel, crystal, ivory, etc.