You have to beat the Pokemon league first and get the national pokedex. Then go to canalave city and go in the sailor's house. Talk to the woman inside the house. Then go outside and talk to the man and he will bring you to full moon island.
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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
iron island, (where you meet riley and he gives you a riolu egg,) Full moon island,(where you first see cresselia,) and New moon island (where you catch darkrai)
New moon island is only avalible in Pokemon pearl, diamond and platinum
no
full moon island