Speak to Skagway @ 19 67 -178

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Evaporate the water that filled the mines.

You'll need the move Overheat

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Save the Miners in the mine.

Find Brisbee @ 18 48 -200

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Battle a level 32 Graveler on the path

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Find Jermone @ -48 47 -189

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Battle a level 32 Onix on the path

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Find Ruby @ -51 51 -238

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Battle a level 32 Rhydon on the path

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Battle a level 32 Lairon on the path

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Find Custer @ -56 46 -302

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Battle a level 23 Relicanth on the path

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Find Coal @ -94 49 -305

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After the cutscene with Coal, you've completed the quest and will receive these rewards: