There's a guy in the desert who says he's lost his memory and only remembers a moon crescent-shaped Pokémon, and that maybe he'll remember when he sees it
>go fetch Lunala from PC and show him
>mfw dialogue changes but he specifically says that Lunala isn't the correct Pokémon

Does this guy want to see a Lunatone ? Did GameFreak include a sidequest that can't be done without Bank ?