The Old Sea Map was an event-only item distributed during the Pokémon Festa event in Japan in 2005. It was never distributed on an international scale. In Japan, the Old Sea Chart was used to access Faraway Island where Mew was able to be caught in Emerald Version.
The only way now to get it is to use a game shark.
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You can't without using cheatcodes. The Old Sea Chart is only obtainable and useable in Pokemon Emerald.
You CANT Get It As A Mystery Gift In ANY POKEMON GAME!To Get The Old Sea Chart,All You Have To Do Is Go To A Nintendo Event.Good Luck Getting It!;]
The Old Sea Chart is a key item given out only through events (however it can be hacked into the game) and is only available to Emerald version.
You would need the old sea chart which was given out at a Nintendo event which has long since passed.
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.