You can't swim to the island while the shark is active. But you can get the ingredients to make a potion that will put him to sleep.
Gather the three ingredients (coconut milk, bone, and key ingredient) and take them to the medicine man, who will mix the potion in a coconut to feed the shark. Wear a grass skirt and he will help you.
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Mirage Island Game Shark CodeThere are no Gameshark Warp codes in Emerald to get to Mirage Island. There is a code but it will hardly work7572668C A25C844CUse this and maybe you can get there
go to the stage then when its the play 'The penguins that time forgot' then it will be on the 'caveman'
You have to have a cheat. (For example a game shark).Or you have to go to a Pokemon convention and they will give you a ticket to the island.
go to the tidal pool at night on the third island and fish in the deep area neer the waterfall. i caught a tiger shark using bamboo fishing pole
Megamouth shark is a rare shark species. It is a deepwater shark.