Lugia is found at the buttom of the Whirl Islands, not on a specific item. To summon him, you must have the Clear Bell from fighting the Kimono Girls in Ecruteak City and the Silver Wing from the Radio Tower.
In Pokemon Heartgold, Lugia can be found at the top-right island of the Whirl Islands Area. It's at Lv. 70 so prepare.
under the rock cave eating a ham sandwhich
you need to find the hidden steps
no. but if you have heatgold you can get it by going to the second island on the right of the whirl islands.
every where
At the bottom of WHIRL ISLAND.
lugia is on the top right island
lugia is in the whirl island on the top right cave
On whirl island
In Pokemon Heartgold, Lugia can be found at the top-right island of the Whirl Islands Area. It's at Lv. 70 so prepare.
To find Lugia enter the Whirl Island Caves at the top-right island, then it should be pretty easy from there (if you're stuck use youtube or similar.)
Lugia is found in the Whirl Islands. There are four separate islands, and you have to choose one of them to search for Lugia. Lugia is in the top right island of the four.
Whirl islands
the top one on the right
You catch Lugia there.
you find lugia in whirl island you need surf and flash to get around but you need the HM whirlpool to get past the whirlpool at the entrance of the cave
go south from Olivine and enter the first cave. you should be able to find Lugia