There are a bazillion transitional forms supporting evolution. Look at the near-complete sequence we have for the evolution of horses, or the now much more complete sequence we have for whales (including whales with legs, whales with vestigal legs, to whales with internal leg remnants, etc.)
Of course the problem is:
Creationist: There's no transitional fossil between A and C!
Paleontologist: I just found B, which is transitional between A and C.
Creationist: Now there's no transitional fossil between A and B, OR B and C! Evolution is disproven!
The real problem is the DNA coding. There are no transitional forms that make the case of macro evolution. Darwinism was replaced with chemical evolution in upper level biology. As that proves unsatisfactory, (happening now,) it will be replaced with something else. Science is rarely static.
These prove that whales have evolved into whales.