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Actually scrap that,you need the old sea map to get there but you have to trade it with someone who has the old sea map on Pokemon ruby/sapphire
The Old Sea Map was an event item that allowed you to access Faraway Island where Mew resides.
Old Sea Charter?First of all it's called the old sea map. you need to go to a Nintendo event
it is 692P66 PP296P 55LO33 22RR66
There was a Nintendo Event in 2005 that lets you get this event. If you didn't go, you won't be able to retrieve the item anymore.