you have to turn bill back into a human then he will give it to you.
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You don't need the boat ticket in Pokemon Platinum because it's the ticket for Luxury Liner SS Anne, which is not in the Sinnoh region.
there is no ss anne that's in the kanto region. Pokemon platinum is in the sinnoh region.
First you need the SS Ticket you get that by helping Bill at Route 25. Once that's done go to Vermilion City and head to the southern port of the city and talk to the second sailor he will let you on the SS Anne.
Once the SS Anne leaves it will never come back although an NPC claims it comes back in a year however since time doesn't pass in the game the boat never comes back.
To help the captain of the ss anne you must rub his back talk to him and say yes to the question and that's it you get HM cut.