Perfect

Perfect (究極体 Kanzentai) is the term used which refers to the 5th stage of Digimon evolution. (Dub: Ultimate).

Perfect Digimon are those that survived the toughest part of evolution and are now among the strongest Digimon. They evolve from the Adult form and sometimes, though very rarely, can evolve onto Ultimate.

(Note: In the English localization of Digimon, the "Perfect Body" level was referred to as Ultimate. Needless to say, this is a source for boundless confusion, because the most common translation for the post-Kanzentai evolutions is Ultimate. Also, "Perfect Body" is the official translation by Toei for Kanzentai however some fans have also translated it as "Complete Body" which is just as correct.)

Baby I -> Baby II -> Child -> Adult -> Perfect -> Ultimate