If my memory serves me correctly, then it should be the one in front of sootopolis city, but be patient. It is very rare.
You can catch it when you use dive.
you can, but you need a dive ball
To catch relicanth use Hypnosis by Gengar and get lots of Dive Balls
go to sootopolis and use dive in the dark part of the water then go out the cave and swim around in the grass
in a dive area near sootopolis city peace :)
to find relicanth have to get the hm dive (witch you can get from battling a gym leader) then use it on a Pokemon and go over a dark patch in the water and press the a button to dive next all's you got to do is move around in the seaweed until you find it
Just dive underwater and find grass where relicanth is and use sweet scent.
Relicanth can be found in the grass underwater..u need dive for this.
Buy lots of Dive Balls.Bring a Pokémon that knows False Swipe.Bring a Pokémon that knows a sleep inducing move.Dive underwater at Route 126 and wander through the seaweed until you find a relicanth.Weaken Relicanth, without knocking it out, using False Swipe.Induce Relicanth with sleep or paralysis.Use Dive Balls to catch it..cheers! :) have fun !
Dive underwater in in the dark patches of water on any of the water routes East of Lilycove. Move around in the seaweed and you should find Clamperl, Chinchou, and Relicanth.
you can find it in the routes of 126 to 127 you have to dive in the water though
Go 2 so2polis city dive down and there are grasses there you will find a relicanth (its reli rare