Surf south until you can't surf no more, then surf west to Pacifidog.
You must surf there from Sootopolis City, Mossdeep City, or Lilycove city. You cannot surf there from Slateport city because there are ocean currents that prevent you from going East.
mossdeep city dhoom
In Mossdeep City.
Mossdeep City.
mossdeep city
look in mossdeep city
Sootopolis city.
go to lilycove city then to mossdeep city then to pacifidlog town and not any other
In Pokemon Ruby/Sapphire/Emerald in Mossdeep City.
Underwater around sootopolis city and mossdeep city
The Space Center is located on a hill on Mossdeep City's eastern side.it is in mossdeep city
You can get Dive in Pokemon Emerald by going to Mossdeep City and ensure you check all the houses.