Pokémon Moon deleting save data?

I just bought my first (and probably only) Pokémon game: Pokémon Moon. However, it was used, and has someone else's save data. I don't know how to delete it though. So I humbly ask, how do you delete save data for Pokémon Moon?
 

Dr. Baby Luigi

Mushroom Kingdom's Most Adorable Doctor
You have to start a new game (under a New Game option) and overwrite the save data in your game. Pokemon lets you have only one save slot, so that's the only way you can delete a save file.
 
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