Ok, I've tried this once before, I think I gotta try it again.
Could anyone tell me the 30/31 Iv Stats on a Cresselia when you catch it? I'm going on a hunt tomorrow, however I will not be able to access a PC to check the IV's so I have to do it all in my head.
Okay, now it's in the right place. lol
Stat: - Nature / neutral Nature / + Nature
HP: 195
Atk: 81 / 90 / 99 <<lol, like you'll need that one
Def: 126 / 140 / 154
SpAtk: 86 / 95 / 104
SpDef: 135 / 150 / 165
Speed: 95 / 105 / 115
remember: + or - 10% adjustment
Also, one stat point difference in the neutral Nature is a 2-IV difference at Lv50. e.g. 195 HP is 30-31, but 194 HP is 28-29.
Good luck. You'll need it.
...
Oh, and make sure you decide your minimum standards before you leave. If you're not sure about keeping a certain Cresselia, it might be a long wait. XD (BTW, Bold isn't the end-all Nature. In fact, the one I kept on my Diamond was Quiet.)
...
Oh, and you are familiar with all the Natures, aren't you? (I still get some of them confused...)