You can't you either have to Trade (or Migrate) or you can use a code (only from Action Replay)
You Have to trade from Pokemon Diamond, Pearl, or Platinum.
I'm sorry, but it's not possible to catch a mew in Pearl, Diamond or Platinum. As far as I know the only ways to get one is transferring one from another game or getting one from an event.
you cannot get a mew in diamond and pearl so you'll have to get the code which i don't have.
Mew cannot be caught on Pokémon Pearl.
Mew cannot be caught in the wild in Pokemon Diamond and Pearl. You need the action replay code.
You cant get a Mew without hack
How do you get a mew in diamond and pearl!?
You cannot catch Mew in Pokémon Diamond, in order to get Mew in your game, you will need to trade for one via Union Room wireless connection.
You can't get a Shadow Mew in Pokémon Diamond because there's no such thing as a Shadow Mew in Pokémon Diamond.
cheat
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
u cant, there is no mew in diamond or pearl. You only can get one with the GBA action replay on one of the Pokemon Ruby,Saphire,Emerald,Leafgreen, or Firered. u cant, there is no mew in diamond or pearl. You only can get one with the GBA action replay on one of the Pokemon Ruby,Saphire,Emerald,Leafgreen, or Firered.