After completing Chapter 3 in Final Fantasy VII Rebirth, you enter the Junon Region where you need to find a Chocobo all over again. To keep you from walking all over the region, I can point you in the right direction for a trusty bird in a new place.
How to Get a Chocobo in the Junon Region FF7 Rebirth
Head northwest of the Mythril Mine to Gabe’s Ranch where you can tame a new Chocobo in the Junon Region. Just like the Grasslands, you need to tame a mount before you can start riding around the map, which means you have another mini-game ahead of you. This time you need to tame a Chocobo named Belle, who is on the other side of Gabe’s Ranch and has plenty of other birds surrounding it. Stealth is the name of the game for success.