You have to visit is to see it on map.
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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.)
all of the island
Johto.
you have to have beaten chuck the gym leader and get whirl pool then cross the whirls then you can google how to get through whirl islands hope that helped.
you go in the water by whirl island