Through normal gameplay you can't but I'll tell you some ways to get a legitimate Lugia.In third generation,if you have the Mystic Ticket,(which you can't get anymore,except through cheating) you can capture it at Naval Rock,then you can migrate it to Pokemon Diamond through the Pal Park.You can also get one by trading with Pokemon XD Gale of Darkness.Purify Shadow Lugia by getting all of the "chambers" in the purification chamber to be a "best circle",then trade it to a third generation game,and migrate it to Pokemon Diamond.Lastly,you can capture one in Pokemon SoulSilver,through normal gameplay,or Pokemon HeartGold in the post-game storyline and trade it over to Pokemon Diamond.
These are the real ways to get a Lugia in Pokemon Diamond.
== == No
There is no Action Replay code in order to get Shadow Lugia in Pokémon Diamond, Pearl, or Platinum at the moment.
at pal park or with action replay (cheats) but with trade I think that is better.
no
you have to migrate or use action replay
Sorry mate. No such thing as dark lugia
yes you put in this one action replay code
you don't
You can catch Lugia at Navel Rock.
there is a way...........trade
Dont know lolololol
You can't. You have to transfer it from Pokemon Leaf Green or Fire Red.