no you need to first go to pacifilog town and surf to the left navigate through the water to find a spot in the middle of nowhere where you can dive down, dive down and find the rock with strange lettering this is braille, it says to use dive here, use dive and you will reach a hidden cavern, put a wailord first then relicanth last in your party and read the rock the caves where the regis sleep are now opened, if there is another rock before the wailord and relicanth one then it says to use dig in front of it.
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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.
No you cannot get the regis nor any hoenn Pokemon all must be traded to you from ruby, sapphire and emerald.
To awaken Regigigas you need to migrate from Ruby/Sapphire/Emerald the three Regis.
You must Migrate from Sapphire, Ruby or Emrald.
ruby and sapphire genius