The final activity in the Special Demo is the chance to go to the Mahalo Trail. Within Hau'oli City is a man who will offer to send you to the Trail if you speak to him. Once there, hop on your Tauros and smash all the boulders in sight. Crush all the boulders, and you will be given some rare Stardust. Like all the other items received in the Demo, you can send them to your Pokemon Sun or Pokemon Moon Game via the Pokemon Link.