Question: pokemon sun and moon what happens when you complete the pokedex?
Answer: When you have registered all 300 Pokémon in your Alola Pokédex (not including Magearna or Marshadow), you can go to speak to the Game Director in Heahea City's GAME FREAK headquarters. He will congratulate you on completing the dex, give you a stamp for your Trainer Passport and give you the Shiny Charm.