go under water in mosdeep city( i think its mosdeep) and keep looking.
You can find relicanth on route 4
You find relicanth underwater near sootopolis city.
near sootopolist
Relicanth, a Pokemon essential for obtaining The legendary Golems, can be found underwater, just outside of the entrance to Sootopolis. Its pretty rare.
Dive somewhere on the sea routes and in the grass down there you can sometimes find relicanth along with clampearl.
In the weeds were you can find when you dive (rare)
on Routes 204/205/206
Just dive underwater and find grass where relicanth is and use sweet scent.
You can find them in Route 4 of Pokemon Black and White 1 & 2.
u go to route four and go to ur left and there should be a pond that u fish in there is relicanth
You have to use the Super Rod on Route 226.
You can find a Relicanth underwater just outside Sootopilis (spl?) City