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It is sort of hidden. Starting from the north end of Route13, make your way south. Once you reach the part where you go down the steps into the really tall grass (the one where you can have double battles). Make your way right until you reach water. There should be a man standing there. Then you need to surf out around the rocks there and travel north along the coast.. Then you are there. This is where you can catch the legendary Pokemon, which is in the inner cave. I do not know haw to get to the inner cave though.

****You have to have the National pokedex to have access to the giant chasm.

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14y ago

What else can I help you with?