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digimon started as, quite literally, tamagotchi but for boys
the original run of the digivices had 2 baby forms, 2 rookie forms, 7 adult forms, and 3 ultimates (so half the roster was "adult" forms)
the second run, which came out the following year, introduced "perfect" forms and increased the number of ultimates
i have a tough time at a glance understanding what is an adult, an ultimate, or a perfect by its design