Well, if you're saving in front of the day care man and then reset and entering the game in a different time, it will probably be different. But lets say you hit "A" at continue screen 2011-06-01 00:01 EACH time, then the nature and IVs will be the same.
Which I assume you're doing Exiledwolf, if not, then I'm a bit unsure of how you can get the same IVs...
I would love to trade you one but I'm in a middle of a RNGing that doesn't seem to work out.
This guide is helpful:
http://www.smogon.com/forums/showthread.php?t=3446600
Once you get the Chatot and still need help, post here or PM me or whatever, and I'll explain it more to you.