you need to beet the Pokemon league and go to carnalave city then go in the sailors and speek to the little boy in bed then talt to the sailor.
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i have beaten the game, and there is no birth island.
there is no fire island on platinum there is full moon island and crsent moon island (were you catch cresilia and darkria) and iron island that is it
in iron island
Iron Island.
New moon island is only avalible in Pokemon pearl, diamond and platinum