Once you get dive in Mossdeep city, surf to route 127 then go left until the water gets darker than normal, then go down until you come across seaweed, then go into the cave and use dive.
*note: If there is no seaweed but a cave you are probably at team aqua's hideout.
sootopilis city
catch raqazza
1.Fly to Sootopilis City 2.surf to the bottom and dive 3.search in the grass
You can see and catch Relicanth under the water just outside Sootopilis(spl?) City, in the mossy grass.
you have to go from either lilycove or sootopilis and rough currents(a BIG secret for the key to the regis is on the way to pacifidlog).
since they have claydol, lunatone and solrock, your best chance lies with a water type. and also take a mightyena or absol to finish it
You can find a Relicanth underwater just outside Sootopilis (spl?) City
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.
There is no PalPark in Pokemon Emerald.
Sinnoh Pokemon DO NOT EXIST IN EMERALD!!!
There is no Autosave in Pokemon Emerald.