The Dawn Stone has only two uses: to evolve Kirlia into Gallade, and to evolve Snorunt into Froslass. In both cases, this involves evolving a Pokemon with a 50/50 gender ratio into a genderlocked form. Arguably, both original, natural evolutions appear gendered as well - Gardevoir resembles a female despite being 50/50, and while Glalie isn't as cut and dry, it appears more "scary" than "cute," which makes it seem more masculine.

With that in mind, what other candidates for the Dawn Stone exist? Gothitelle, for instance, clearly appears female, but is 25/75. While not following the 50/50 pattern, it seems a good candidate for the Stone.