Chocobo Raising Questions

I've raised a chocobo before, and he came out pretty awesome. Got a Pullus Torque etc, currently doing C2 races yadda yadda.

I still have a few questions:

• I heard you can have an egg born with a weather preference, how would you go about causing this? Or is it a random chance based on parents or something.
• Is it possible to have average stats across the board before it reaches adulthood? If so how.
• Do you have any suggestions on how to get the rainy weather preference? I was going to raise my Chocobo in Bastok and maybe only walk it in Passhow while it's raining.