Thread:Raised By Wolves/@comment-2212492-20160602130923/@comment-2212492-20160630105043

Yeah but since they're supposed to reveal Mega Evolutions, those technically do count as evolutions to Pokemon from previous generations.

If you were not to count those, Sylveon is the only Pokemon that has evolved from a previous generation's Pokemon since Diamond & Pearl. However, Eevelutions tend to appear in even-numbered generations so that may be the case.