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You cant get a Mew without hack
# # #
no
transfer from emerald
No you cannot.
Mew and Mewtwo are not found anywhere in the Sinnoh region.
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.
There is no Pokemon called Mew3 if you saw it on YouTube it was a hack.
There is no such thing as cursed mew.
I don't think you can get it without action replay, GameShark etc.