Final Fantasy VII - Blue Chocobo

Getting Blue Chocobos
Blue Chocobo Introduction
To breed a blue chocobo, you will need to mate a Great chocobo with a Good chocobo. This may also produce a green chocobo if it is your first time mating these types.

The way it works is that the first time you mate them, the result will be either green or blue. The second time, it depends on the genders of the first mating. If you mated a female Great chocobo with a male Good chocobo to get a green chocobo then you will need to mate a male Great chocobo with a female Good chocobo for the blue.

Reference the Yellow page to locate the chocobos you need. The guy at the Chocobo Ranch will let you know what kind of chocobo you have.
Before Breeding
Before breeding your chocobos, you should head over to the Chocobo Sage area located near Icicle Inn and buy lots of Sylkis Greens. Feed 99 to each chocobo. Also buy some Carob Nuts.
The next step is to race your chocobos at the Gold Saucer up to S class.
At the Chocobo Ranch, select the breed option and use a Carob Nut.
Yellow Green Blue Black Gold Materia Caves