Where can I consistently find In training 1 digimon? (Babies)

So on my second run I got a little weird because of "digivolution history" and I'm only keeping full evolution lines (botamon-koromon-agumon-etc all the way to wargrey) and the rest I've been loading. But after a while I realized you don't find babies so easily as the game progresses and it seems I'll need to wait until endgame to revisit some areas and find more.

So my question is, is there s simpler way to get them that I'm missing? Ok Cybersleuth you could outright buy them or visit the hallway like dungeons but the outer dungeons don't seem to give convert data