You must have the move anywhere code for platinum. Go to snowpoint city and then go to snowpoint temple and walk around the lady. Go to 5f where the regigas statue is and there should be a boulder next to the wall. Then there will be the cave entrance.
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somewhere in shoal cave somewhere in shoal cave
Go pass Mossdeep city surf to a cave where two girls are and there you are at Shoal cave hope this helped :]
Kyorge does not appear in Shoal Cave. In Pokemon Sapphire Kyogre appears in the Cave of Origins as part of the story. In Pokemon Emerald Kyogre appears in the Marine Cave after defeating the Elite Four.
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the old man in shoal cave will make you useful items with the shoal salt