You find relicanth underwater near sootopolis city.
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They're a rare Pokemon you can find underwater just outside of Sootopolis. Other than in Ruby, Sapphire and Emerald, you cannot obtain them.
You can catch it when you use dive.
When you're in the Sealed Chamber, Relicanth should be first and Wailord should be last.
How do you catch latios in Pokemon sapphire
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.