To get the harbor mail you need to go to slateport city
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You go to Slateport city and go to Pokemon market. Here you can buy Harbor mail.
trade harbor mail with a girl in mauville
You buy harbor mail and give it to a girl she will give you a coin case.
yes in slateport town pokemart or in the trick master house one of the levels you can find it
get a harbor mail from the trick house then trade it in to the girl in the house right next to the mart in mauville city