Well, I beat the game and max out my stats for all girls. Research taking the longest due to resources. And I have like 269,000,000 mons. Here is the photos of my victory!
Edit; I feel like the girls should go to S+++ both in stats and their general rank and have at least 10 girls in total. And maybe during end game, use money to buy skill points in a skill tree for different stuff? This might be late but that's how I feel. Otherwise, good game.
Fun fact; Did you know the girls go in alphabetical order in their name?