u have mate pikachu and make a pichu then pichu runs away and you find pichu on your house with the old sea map
you get mew on faraway island from the old sea map at an old Nintendo event. now a days you have to get it from a gameshark.
The Old Sea Map was an event item that allowed you to access Faraway Island where Mew resides.
Answer:It was distributed during the Pokémon Fiesta event in 2005 in Japan, but unavailable to international players (without cheating)
You would need to get the map called the Old Sea Map through a cheating device such as a Codebreaker, Gameshark or Action Replay since the Old Sea Map was never distributed outside of Japan.
On ebay
Nowhere.Old sea map is only gift for you.I hear this.
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
in lilycove city go to Pokemon center and ask them all and one old man will tell about you to find mew ad he will gave you the old sea map or if you have a action replay use that hey that's cheating good luck because mew is not easy to catch
An old sea map is a map you get from mystery gift and if you have a old sea map you can catch mew. You can also get different stuff from mystery gift and catch different Pokemon like deoxys, ho-oh and lugia. But I think it is impossible to get the old sea map, why? Well because I've tried the mystery gift thing with a wireless adaptor like 100 times and still didn't work, if it worked for you, you got lucky>_<so try your best and get mew!^-^
its impossible
Mystery Gift
Old Sea Charter?First of all it's called the old sea map. you need to go to a Nintendo event