There's No Code, But of course you can catch your mascot Pokemon for the version, but you can also get both if you make it to Pewter City and get a Silver/Rainbow Feather (Depending on the Version) from a old dude that looks like he is wearing an A-Shirt on a Hill with little stairs. He will tell you something like "I found this in the Johto Region on my travels". and give you one of the 2 Feathers (Depending on the Version), Also try this Chart.
Lugia Chart:
If you own Pokemon Soulsilver, Lugia will be at lvl 47 in Whirl Islands
If you own Pokemon Heartgold, Lugia will be at lvl 70 in Whirl Islands.
Ho-Oh Chart:
f you own Pokemon Soulsilver, Ho-Oh will be at lvl 70 in the Bell Tower.
If you own Pokemon Heartgold, Ho-Oh be at lvl 47 in the Bell Tower.
There is no Action Replay code in order to get a Shadow Lugia in Pokémon Pearl.
== == No
There is no Action Replay code in order to get Shadow Lugia in Pokémon Diamond, Pearl, or Platinum at the moment.
There is no way to get Shadow Lugia in every game, only Pokemon XD: Gale Of Darkness has it.
Shadow Lugia doesn't exist anywhere but Pokemon XD: Gale of Darkness.
Absol:Yes there is no such thing as a shadow lugia but you can make one as a hack (not for games0
you have to talk to lyra after you deafet elite 4 then you have to give her exp share and she will give you shadow lugia lv 47
no, sorry.
Action Replay
you have to have action replay
there is no code nore will there ever be a code for a dark lugia... get Pokemon xd on the gamecube if you want a shadow lugia!!! Though, you'd have to 'purify' shadow lugia into a normal one before moving it onto another game ...
not even a reaply code can get it at least i dont know one