It looks like a brown fish with closed eyes and a red spot on it.
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It doesn't on any of the games, and you can't teach it to him/her with aTM either. To find out the answer to questions like this one and many more look up serebii.net
Relicanth is a Rock and Water type pokemon.
You can find relicanth on route 4
You find relicanth underwater near sootopolis city.
No trainer in the game has relicanth in ruby but you can find it around sootopolis city underwater.