Mirage island red star?

Question

Ive caught all the legends on pathless plain, and the red star is gone.
I caught cresselia, and today the island reappeared and the star is still there, but when I go there there isnt anything to do.
When does the red star appear?

Answer 1

When the island is accessible. Literally this.

Comments

But the pathless plain red star has vanished when i got all three of the legends there, and its been missing ever since

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Well its one of many islands, pure luck.