I don't think this deserves a new thread and this has probably already been discovered, but Cresselia's IV's and nature are set when you first meet her. I soft resetted my game 3 times and attempted to synchronize a nature with Abra, but I got the exact same Cresselia each time. This really sucks for anyone trying to get a good natured, good IV'd Cresselia :/
With that said, my roommate was insanely lucky and managed to catch a Calm Cresselia with decent IV's, so hope is indeed out there.
With that said, my roommate was insanely lucky and managed to catch a Calm Cresselia with decent IV's, so hope is indeed out there.