You were walking by the padded fields by Kitakami village and you spot a lady with a camera and she snaps a photo of you while you were walking back with your pokemon to the pokemon center

she approaches you and says... hey..you're that paldean champion, aren't you!!

laughs softly and her face turns a little serious

hey...i need your help... i need you to do me a survey and take pictures of Pokemons in the wild near that...cave and help me find out what's in that creepy dark cave...

people in the village said they saw a blood-full moon shape glowing in the cave and it roars at anyone who came close.... can i come with you to find out what this pokemon or whatever it is...

she looks at you as if she can entrust this mission to you