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You cant get a Mew without hack
no
All Pokemon list require a trade or you to import via Pal Park. As none are wild in Pokemon Diamond.
transfer from emerald
No you cannot.
Mew and Mewtwo are not found anywhere in the Sinnoh region.
You can not get a mew in Pokemon Diamond without trading or cheating (HIGHLY NOT RECCOMENDED.) but there is a way to get a mew in the following games: Pokemon Blue, Pokemon Red, or Pokemon Yellow. look up "Mew Glitch" in Google search and find out how. hope this helped!
After you get it in one of the GBA Pokemon series, transfer it to Pal Park by Dual Slot.
It is imposible without an Action Replay unless you get it in a GBA game and transfer it to Diamond/Pearl throu pal park.
If you have log cabin ranch then you can receive Mew from Hayley(only pearl/diamond)
You Have to trade from Pokemon Diamond, Pearl, or Platinum.
The only way now is to trade for Mew with other players. The events are no longer available for Pokemon Diamond.