You can get it in GTS or trade it from Silver or Gold
You can't catch a Lugia in pokémon platinum. If you would get a Lugia on platinum you should link it.
You cannot find Lugia in Pokémon Platinum.
Shadow Lugia does not exist in platinum.
You cannot find Lugia in Pokémon Platinum.
Sorry. You cannot obtain Lugia in Platinum. You have to trade it from HGSS.
You don't. Shadow Lugia is not available in Pokemon Platinum.
You don't. Shadow Lugia is not available on Pokemon Platinum.
Lugia is not available at all in Platinum, so hacking is the only way.
MAYBE
No
The only way to get Lugia in Pokemon Platinum, is to use Action Replay, or to trade from other games.
I don't think you can get lugia in platinum but for sure you can get Lugia in Pokemon heart gold, soul silver and when you got Lugia in one of those games trade it into you,r platinum game. hope it helps Brunoistheman ;D