you cant you have to find him
on map 1
in tall grass somewhere around 12 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.
You can't catch Mew in Pearl unless you have special map (you can find it at Nitendo events). Mew is located at Faraway Island. If you don't want to take the map from events, you can always cheat with Gameshark. . Greetings, -croman
you can find a mew mew power costume on ebay.
You get mew on faraway island by getting the Old Sea Map. Hope this helped!:)
after you beat gyms elite4s look in the grass in map12
you can find mew ichigo/zoey mew lettuce/bridget mew pudding/kiki mew zachruo/renee and mew mint/corina on ebay!
Mew can be migrated from Pokemon Emerald if that game was participated in the Japanese Mew event to get the Old Sea Map or have 999 Pokemon in Pokemon Ranch and Hailey will give you Mew.
You do the mew glitch go to youtube and find out .
Episode 42
in any game mew can be found in a glitch,in emerald you need the event item old sea map that will allow you to go to faraway island and mewtwo can be found in kanto in cerulean cave