In this section, I will tell you how to breed a gold chocobo. It can walk over mountains and deep water allowing you to go anywhere on the entire map.
To start off go to Bone Village. (it's on the northern continent) Go in the grass by Bone Village, not the forest, and run around until you get into a fight. If it's not the red dragon guy then kill the enemies and continue. (I know the guys name I just dont want to type it out) Keep getting into fights until this guy comes up, then steal from him. You will get (if it's the right enemy) the "Carob Nut". Do that three times because you will need three Carob Nuts. Now go to the Icicle Inn area (also on the North Continent) and findthe Chocobo Tracks. The Chocobo guide is at the bottom. Anyway get about four chocbos here, then go back to the chocobo farm. Find a "Wonderful" chocobo out of the 4 and put him/her in the stables. Then let the rest go. (this chocobo is for the future) Now go to the gold saucer area. Look around for Chocobo Tracks. Now get 4 chocobos here. Go back to the chocobo farm, and and search through your 4 chocobos for a "Good" Male or Female chocobo. Let the amatuer chocobos go. Find a "Good" Male/Female and put it in the stables. Then find a "Good" Chocobo of the opposite sex and put it in the stables. If you only have good chocobos of one sex then take one and let the rest go, and go back to the Gold Saucer area and do the process over. Ok if you did all this successfully, which in time you would, go back to the chocobo farm. Feed a bunch of greens to your female "Good" chocobo you have. Then race her to get her to class "S". (2 short track races and 1 long track races) Now go to the chocobo farm and breed your Female class S chocobo to your male class (S or A) chocobo using the "Carob Nut" you stole. You should get a blue (river) male/female chocobo, or a green (mountain) male/female chocobo. Now kill some time so you can wait for the chocobos to be ready to mate again. What I usually do to kill the time is fight that 30 foot "snake" called the "Midgar Zolom" that's in the marshes 3-5 times. Go back to the chocobo farm,TIP: SAVE BEFORE ENTERING and mate the good chocobos again until you get the blue (or green if you already got blue) chocobo of the opposite sex as your first colored chocobo. Now go back to the "Midgar Zolom" fight him three times, and then go back to the farm. AGAIN: SAVE BEFORE ENTERING Mate the blue, and green chocobos. If you don't get a black chocobo (river & mountain) hit reset and do it again. Repeat this process until you get the black chocobo that is the opposite sex of your "Wonderful Chocobo" (the first one you put in the stables). NOTE: Your chances are better if both the green, and blue chocobos are class S. Next go to a place called "Goblin Forest". This area is on an island that is North-East of the chocobo farm. Fight the creatures called "Goblins" and do a steal. You should get the "Zeio Nut". Now go back to your chocobo farm and mate your "Wonderful Chocobo" with your "Black Chocobo" and use the "Zeio Nut". Remember they have to be the opposite sex. Keep doing it over and over until you have the ultimate "GOLD CHOCOBO". You may be thinking now, "Why did I go through all the trouble for this, its just a chocobo!" Well go to the island that is north of the island "Goblin Forest" is on, (this island looks like a crater kind of, and it doesn't appear on the World Map) with your GOLD CHOCOBO and go into the cave. Guess what ya get? KNIGHTS OF THE ROUND : The Ultimate Summon.