You can get Mew by only trade now.
no
No you cannot.
Trading from Emerald is your most probable option.
I don't think you can get it without action replay, GameShark etc.
The only way now is to trade for Mew with other players. The events are no longer available for Pokemon Diamond.
It is imposible without an Action Replay unless you get it in a GBA game and transfer it to Diamond/Pearl throu pal park.
You can't unless You have pokesaved a mew
Either by migrating (you have to have a gba Pokemon game with a mew) or you can have someone trade you one.
there was an event to get mew on diamond at toyrsus a few months a go anway i think youneed an action replay
you need action replay or any kind of hack to get mew
There is no such pokemon as Mew-Three. But there is Mew and Mewtwo.
It is only possible to get Mew by using an action replay or trading it off another game