Welcome to route 1. On this route you can find the Pokémon Lab, trainers school, and ten Carat Hill. Though you will not be able to travel into Ten Carat Hill just yet, you must complete your island challenge first in order to go in. But you can still catch plenty of Pokémon on this route if you wish.
Route 1 leads to Iki Town, Melemele Sea and Hau'oli city.