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!
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In Pokemon Ruby/Sapphire/Emerald in Mossdeep City.
You have to surf there first. From Lilycove City, you surf to the right till you reach Mossdeep City.
Shoal Cave above Mossdeep City
Shoal Cave, north Mossdeep City
You obtain HM Dive in Mossdeep City from Steven after getting the Mind Badge.
How do you unlock the door in the old man's house who lives on mossdeep city on Pokemon Ruby
There's the space center in mossdeep city if that's what you mean.
with your foot