The location to Wailord is to the far right and far down. The location of relicanth is underwater,border of sootopolis island, north of sootopolis island and little east of lilycove city.
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When you're in the Sealed Chamber, Relicanth should be first and Wailord should be last.
Train a wailmer to level 40 to get wailord and you can capture relicanth underwater near sootopolis city.
You find relicanth underwater near sootopolis city.
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.
You need relicanth and wailord to catch the regis in sapphire/ruby/emerald. You cannot catch the three regis in platinum unless you have the event Regigigas (this event has now ended). If you have the special regigigas in your party, three new caves will open up in Sinnoh and you will be able to catch the three regis.