In the Final Fantasy X-2 artbook, it is stated the pets owned by the girls when using the Trainer dressphere are spirits. It is assumed the Trainer dressphere houses the spirits of Kogoro, Ghiki and Flurry, just as the Songstress dressphere holds Lenne's. If the player sleeps in the cabin on the Celsius at least once per chapter, they will be allowed to rename their pets by speaking to Barkeep and selecting "Pet Shop".