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Only by a Nintendo event.
You can't without using cheatcodes. The Old Sea Chart is only obtainable and useable in Pokemon Emerald.
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.
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!;]