nope. You can see it clear as day just by looking at the map, even without zooming in. Dunno which Island... I think 3rd...?idk what you talking about maybe the eggutor island ?
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You have to go during the day in moon, or night in sunWent there with my Lunala in my lead and it just says
"There is a strange distortion in the air... but you don't seem able to traverse it now."