First you go to the house next to the game center. then you talk to to lady and she should say that she wish she had a bike to go to slateport city to get harbor mail. you go to slateport city and get one harbor mail. then talk to the lady again and she should want to trade the coin case for the mail.
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you cant get reggiggas in Pokemon emerald
there is no mist stone in Pokemon emerald
Go to celadon city and find the cafeteria its one of the houses on the bottom talk to the guy at the top left and he will give you his coin case.
You cannot find an infernape in Pokemon emerald for that Pokemon you need Pokemon platinum, pearl or diamond.
You can't find a Dawnstone in Pokemon Emerald