! Zeio Nut
Unlike the carob nut, you just need one zeio nut to use with your black and wonderful chocobo. To get one, land in the north eastern island in the world map with a lone forest in it. This is the Goblin Island. Once there roam around inside the forest and get into a battle with a goblin. Steal the zeio nuts from them. You might also wanna equip the enemy skill materia since they the goblins have the attack Goblin Punch.