What is the old sea chart?
the old sea chart is something you use to obtain mew You can find it by clicking on rocks and pot holes
How do you get the Old Sea Chart in Pokemon without using a Game Shark or going to a Nintendo Event?
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.