You really don't get a "most" possibility. It is either all, 50%, or none.
I think what you are looking for is "as much as possible", in which case, the super of any co-dom is what you want. Robin gave you the example of a super pastel, and there are lots of others.
With a regular pastel or any other regular version of a co-dom, you will expect 50% of the offspring to show the morph, but the odds don't always give you what is expected, so you could get anywhere from all morphs to all normals.
If you go with something that is a recessive trait, such as albino, none of the first generation offspring will show the trait, but all of them will be 100% het for the trait.
EDIT: Of course as soon as I clicked submit I realized I forgot about the possibility of multiple morphs in one snake, such as the bumblebee. In that case, you'd expect 25% bees, 25% pastels, 25% spiders, and 25% normals. Again, the odds will most likely not give you exactly what is expected.
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