http://www.pokecheck.org/?p=detail&uid=310293
This (shitty hack) Swoobat is level 1, which is impossible because several evolved forms due to levelling up with high happiness must be at least level 2, but it shows up as Valid under Level.
EDIT: Just remembered Roselia, Snorlax, Chimecho, Marill, and Chansey are not subject to this rule because of Incenses. Also, Leavanny must be at least level 21, Crobat at least level 23 (or 18 if it's from the Johto Safari Zone). Corrected initial post to reflect this.