I nicknamed my Regice Glacier, had it hold an Icy Rock, and went to the island cave with all three Regis in my party, but Regigigas wasn't there. I figured it had to do with the little girl in Paficidlog Town, and she keeps saying the same thing: "'Six dots open three doors.' Grandpa used to say that and I was always wondering what he meant. I had no idea it was some secret to meet special Pokemon. He told me another story too. I wonder if this has some hidden meaning, too... Grandpa used to say that this huge Pokémon sometimes visits our region. But you'll need to have something cold to meet it... I wonder what he meant. Ice cream, maybe?" She's said this exact thing like three times. Does she eventually say more about it, or do I have to do something else to trigger it?