Lorelei's Jynx needs to evolve by kissing an innocent boy.
http://jackurai.deviantart.com/art/Prima-s-Jynx-588404563
Click the green buttons for the true ending. Click on Jynx's lips when the scene pauses before a kiss to see an Easter egg (you'll know when).
Not really a fan of the Easter egg, but the true ending is awesome. I won't spoil it for you.