There is no use for the SS Ticket in Pokémon Platinum.
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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.
beat the elite 4 and steven to get the ticket
i dont know D:
You have to get the S.S. Ticket from Professor Elm after beating the Elite Four.