U hav to beat the champion then talk to your mom and she'll say Barry said you need to get on a ship at snow point city
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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 use for the SS Ticket in Pokémon Platinum.
Once you've beaten the Zhery Elite Four, you'll be given a ticket to the Lauren region. Go to the Seanport City ship port and take a ship to the Lauren region.
Just go to Lilicove and use the ship after beating the Pokemon League
i don't think you can get the eon ticket in pearl or diamond unless you hack the game, or use action replay. i tried to get it in platinum, pearl, and diamond, but no luck.