Could you define “kind”? If “species” is what is meant, then the genus Otodus and the Argopecten gibbus species group form obvious counterexamples. If a higher level is meant, then what are Myllokumingia, placoderms, stem tetrapods, gorgonopsids, and rostroconchs, if they aren’t transitional?
Also, given that most fossils in well-preserved deposits are transitional, no, you can’t find a “single” one, you can find millions of them. I have tens of thousands of them in the room I am sitting in right now.