Once she learns about Team Rocket, Minfilia will be wanting to work on some form of plan and defense against them, and would appreciate working with somebody who's been here for so long. She may be new, but she is very determined!! (Also to prove herself, and establish herself. Though overworking herself... doesn't help that she now has the goal of trying to take down one of the Champs because he was Not A Good Person.)

She can also try and help him figure out what it is an adult is, when you've not had a lot of opportunities to grow as people should in peace... (she HAS dedicated all of her life to a single cause, and is resistant to changing such, but. Goals!)

Also, Minfilia is aiming to train her Pokemon quickly and efficiently (alongside herself) - so, would it be okay in the future for her to take advantage of the Training Center? She mostly wants to test out unusual strategies - to make sure they'll work before she uses them on future gym leaders, and eventually the league.