Your wish was granted, however you will need to get your chocobo to rank 10, complete 10 chocobo companion quests which gradually unlock each time your chocobo reaches a new rank from rank 1-10, buy or grow 5 of each chocobo food available within the game excluding Thavnairian Onion these chocobo foods will be needed to craft 1 chocobo vegetable gourmet, then you must feed the fat chocobo the vegetable gourmet then finally you will have the fat chocobo as a companion.

I wish I could 1.0 Coerthas back and all of 1.0 music back within the game.