go to Pokemon league
You can't. Trade with someone or get a Action Replay and use the Poke Modifier.
you cant as sinnoh is the wrong region. or you could enter a cheat code
You cannot have shadow lugia on pearl unless you can find a code.
find it supercheats
In Pokémon Sapphire, you can encounter Lugia by using the cheat code for the GameShark or Action Replay devices. The common cheat code to encounter Lugia is: "BFF956FA 2F9EC50D". This code allows you to encounter Lugia in the wild, typically at level 70. Remember to save your game before using cheats to avoid any potential issues.
there isn't one
herse the code 123455673dab346d2000000000000056332244433222
yes it is 123324`2342342423423423424323423423423423423423432
There is no Action Replay code in order to get Shadow Lugia in Pokémon Diamond, Pearl, or Platinum at the moment.
There is no Action Replay code in order to get a Shadow Lugia in Pokémon Pearl.
There might be a action replay cheat code but I do not think its possible without the action replay. I am serios but sorry I do not know the cheat code.
no you cant because you need a cheat code