The only way now is to trade for Mew with other players. The events are no longer available for Pokemon Diamond.
Action Replay or you could never get one without that pass... :-/
well you could only get it with the action replay
you could use an action replay for game boy advance.or an action replay for ds.the gba action replay is only for gba Pokemon games.but the action replay is for any ds game.i recommend that you get an action replay for ds.
you can't do that you need a action replay or R4 if you want cheats. or.... you could probably use the events to get legendaries.but i know you can't use cheats without a action replay
You could either use an Action Replay or a Nintendo event.
you could use action replay or trade with friends
no you cant it is impossible, but you could get999 with action replay.
You could try an Action Replay with Pokesav.
1. you could wait for a migration of them to come. 2. you can use an action replay.
You can trade from the GTS or from someone else.
you could use action replay but if you dont have action replay train at the Pokemon league which will take about a day depending on its level when you start.
The R4DS already has action replay built into it so you can use AR codes without the need of an Action Replay chip.