How do you get to mossdeep city in Pokemon Omega Ruby?

To reach Mossdeep City in Pokémon Omega Ruby, you must first obtain the HM Surf, which allows you to navigate water. After defeating the Gym Leaders in Sootopolis City, head east to Route 127, then continue to Route 128. Follow the water route to the north, and you'll eventually arrive at Mossdeep City. Be sure to explore the area and challenge the local Gym for more adventure!