After you get it in one of the GBA Pokemon series, transfer it to Pal Park by Dual Slot.
In any game of Pokemon, not just Diamond and Pearl, you either cheat to get him, which i wouldn't recommend, or wait for an event for mew. Mew is my favorite Pokemon!
Mew cannot be caught in the wild in Pokemon Diamond and Pearl. You need the action replay code.
cheat
You cant get a Mew without hack
Trade.
you can not you can only get it in diamond and pearl
you can't get mewthree.MEWTHREE IS NOT A REAL POKEMON
Deposit 999 Pokemon into the ranch from pearl or diamond.
the only way to get mew on Pokemon diamond/pearl is cheat with an item such as an action replay or cheat on the gameboy advanced verions with an item such as gameshark then migerate.
If you have log cabin ranch then you can receive Mew from Hayley(only pearl/diamond)
you need action replay or any kind of hack to get mew
go to pokemon.marriland.com then go to the diamond and pearl pokedex section and search mew. the moves pokemon learn in diamond and pearl are the same as yellow.