I know one is village related, and you wouldnt normally do em in a run, and the other is tama reversed, my current guesses are that maybe if you get a certain item after getting egg, thst it will transform, or that you would feed cheese to a certain monster before hatching the egg? but I have little idea for the village, as mine keeps resetting, maybe if you have 2 specific monsters in a nest you get a secret one?
not sure which one I am on the right track for, I'm assuming its the village one though, besides that I guess I'll have to keep playing, can't really think of how the inverse of tama wouldn't involve items
Edit: I added mabek, kabu, and mudgill into a nest so that the ladders would add up to "Mabu", I feel like I am over complicating it