You can't develop anything in the main story. Once you get to the aftergame, delegating develop will actually work and you can invest manually via the bank.
didn't know you could develop the areas that way, I only thought Develop was useful for raising energy of pokemon, gonna have to give this a try and see. I do know that some areas I have conquered have been developed a little bit already before I get them, but that was never because of my own delegation.
To those that claim to have no religion, sorry you grew up without a dictionary. Religion is having a belief, you believe in nothing.