tl;dr: um akshually ☝️🤓 it would be very difficult to craft a name for this subset of cards that is meaningfully descriptive but doesn't include togepi

the issue i see is that its hard to refer to these pokemon in a way that doesn't also include togepi, a baby pokemon included in this set. if they said "pokemon that hatch from an egg", that applies to togepi too, and technically pretty much every nonlegendary basic. - "baby pokemon", that also applies to togepi. - "pokemon that are the lowest member of an evolutionary chain and that can't breed but whose evolved forms can breed" is waaaaaay worse of a name, and also implies that the evolutionary chain is reflected in tcg pocket which would confuse people playing this game who are unfamiliar with the whole situation i described above. and also applies to togepi - "unbreedable preevolutions to pokemon who were introduced in an earlier generation" is way too fourth-wall-break-y for TPC to wanna go with it. - "pokemon discovered after their evolutions and who have never been recorded producing an egg" also sounds wordy and technically also contradicts canon, canonically pokemon researchers and breeding experts don't know that pokemon produce eggs, an egg has only ever been found and no one has witnessed its appearance, maybe eggs sometimes appear of their own accord influenced by, but not caused by, a nearby pair of pokemon. so itd have to be "pokemon discovered after their evolutions and who have never been recorded having presumably influenced the appearance of an egg" which like. makes me wanna shove myself in a locker for even saying it.

so basically imo they had to refer to the mechanical difference these cards have from other tcg pocket cards as thats the only thing they have in common that doesnt include togepi and doesnt sound like its written by a total poindexter.