Some people say that you need to be Lv 100 and Master rank to get Darkrai. This is NOT TRUE! There is a very simple way that very few people notice. Simply throw food at Darkrai. By food I mean beneficial berries, apples etc. For best results use black gummis. That's not to say you need to use your rare gummis on Darkrai. I recruited him first time just by throwing about five apples and Orans at him. I was Lv 80 at the time and not Master Rank. Enjoy