First, travel to Olivine City. Then, surf Southwest of Olivine to get to a Whirlpool. Then, use a Pokemon with Whirlpool to go across the whirlpool to get into the Whirl Islands.
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go to whirl islands
you need the silver wing
you can use flash dont go to the mini cliff
there is no map. just use the pokegear. to get lugia you need to get a certain item first.
Summon Lugia with it at @ Whirl Islands Ancient Chamber