Thanks for trying my game, yeah that’s something I should either put in the tutorial or try to find a way by making it obvious in the game design. I kind of tried it but that doesn’t seem to be working well. There is a quest that gives you a building that helps you with the digivolving requirements (dojo) and there are quests around the world that give you all the “baby” digimons. Every other one you get them by digivolving the babies you got.
I just didn't make it to the dojo then. After the tutorial quests that teach you about digivolving I didn't want to spend resources without knowing how to work towards the next digivolutions but without the dojo unlocked yet that's just guesswork.
Maybe putting the dojo a bit earlier on or something would help