After you beat the league and get national pokedex by having 60 species of Pokemon GO to celio on 1 island and get him the gems to fix his machine once the machine works the purple hair dude will leave, if you need help with finding the gems go to pokemondream.com they have a great walkthrough.
BRENDAN MILLER :^)
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It is Altering Cave which you can enter only after you beat the Pokemon league.
You have to beat the Pokemon League.
Beat the Pokemon league!
beat the Pokemon league
My Pokemon