Catch 2 Great Chocobo/Good Chocobo
Breed with Carob Nut
Repeat until you have both Green and Blue Chocobo (Female and Male)
Mate the two with another Carob Nut for a Black Chocobo
Mate with a Wonderful Chocobo with a Zeio Nut to get a Gold Chocobo

Great/Good Chocobos : Corel, Mideel, Rocket Town
Carob Nuts : Bone Village monsters
Wonderful Chocobos : Icicle Inn
Zeio Nut : Goblin Island

Helps to race Chocobos to high class ranking,

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Q. Where are the 6 Turtle's Paradise Flyers across the world?