Route 124 and 126, both of them underwater. This Pokemon is one of the extremely rare variety, so it will take time to find it. It's also a rock/water element so don't use electrical moves on it.
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You can find relicanth on route 4
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.
Get relicanth and wailord. Put relicanth in the first slot and the wailord in the last. Then make a pokemon who has dig use dig.
Relicanth can be found on Route 124, Route 125, Route 126 and Shoal Cave but only on the ocean floor. You must have a Pokemon that knows Dive in order to get to the ocean floor. And, obviously, you should probably bring along quite a few Dive Balls in order to have a higher chance at catching it.