Oh, Sumire? Yes, she was the one I got when I arrived here. Ignore her, she's just being silly. [She waves off the Mismagius, who merely gives her a "oh you did not just do that" look.]

Really? If your friend can talk to the spirits, then maybe they can talk to Ghost Pokemon as well? I was able to speak to animals and spirits back at home, that seems to have translated into speaking to the Pokemon here.