Phantom and Nightmare are two animtronics created at the same time.
Backstory[]
Phantom and Nightmare were made by a witch who wanted them to hunt humans. Phantom would hunt adults and Nightmare would hunt children. The witch cast a spell that gave Phantom the abilty to turn other animtronics into phantoms he can control. And Nightmare got the ability to turn other animtronics into nightmares he can control. So the hunting began. Phantom turned many animtronics into phantoms while Nightmare did his job. Until one day when he created phantom Bonnie. He took a liking to him and they were very nice to each other. But one day a human decided to dismantle Phantom. Phantom knew that someone had to hunt the adults so he gave his power to phantom Bonnie just before he died. Bonnie still had the appearance have the phantoms but no one could control him. He renamed himself SpringBonnie/Springtrap.
And that's why there is no phantom Bonnie in the game.