Conditions to obtain adults are based on the number of care mistakes made throughout their life. Care mistakes are cumulative so mistakes made during the baby, child, or teen stage will be counted together (Ex: For a male, 2 CM in child stage + 1 CM in teen stage will result in Weeptchi whose condition is 3 CM)
These characters are only obtainable from specific TamaSma Cards. Conditions for obtaining a card character is dependent on having a specific food or item being used the most out of the existing food/items on the card. (Ex: For the 1996 Friends card, if the Choberi Milk snack is the most fed item for a male teen, they will evolve into 96 Mametchi). The easiest way to achieve the condition is to either only use the required item and none of the other card items in the teen stage or use the required item a lot of times compared to the other card content.
These characters have been shown in the reveal trailer to be accessible on the Tamagotchi Smart via a Tama SmaCard, but further details are currently unknown. All of them have previously appeared in the Tamagotchi m!x: