[Aeolus]

1: Not always yellow, I got a blue one. Depends on how well you treat them. So far Ive only heard of yellow chics being born to pretty crap trainers. Dont feed, excerise etc. Dont even look over it when its still an egg. All helps.

2: Yes, if you have 2 chococards(m & f) you can give them to the guy in jeuno and select a honeymoon package. Your egg will be collectable next day(after jp midnight) I think, takes a while anyway. If you treat it right it will hatch same color as parents.