You get the silver feather from someone in Pewter city. From there, you can catch Lugia at Whirl Islands. He'll be level 70.
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In heartgold, Lugia is obtainable at the Whirl Islands but u need to obtain the silver feather from a guy in Pewter City. Once u have that silver feather, u can go deep into the Whirl Islands and find Lugia.
Go to Pewter city and talk to an old man on the right of the poke mart he will give you the silver wing.
well first you get to the Kanto region by beating the guy on mt. silver then there is a town called pewter city. In pewter city you will get the feather from the old person right next to the poke mart.
You need to obtain the Silver Feather from a person in Pewter City. Once you have it, you can go to the bottom of the Whirl Islands and Lugia will be there at Level 70.
A person in Pewter City will give you the Silver Feather, then go to Whirl Islands. When you get to the end of the cave you will see Lugia.