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You have to have HM03 (Surf) from Petalburg City and HM08 (Dive) from Mossdeep City. You must also have the ability to use them outside of battle, so you have to have the Mind Badge from defeating the Mossdeep Gym, and the Balance badge from defeating the Mauville Gym. Stand by a surface of ocean and use Surf, then when the water gets darker, float over it and use Dive. You will then be underwater.

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15y ago

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