Speak to Isaac and Danielle near the PokeCenter @ -186 38 413

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Gather clues

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Speak to Danielle @ -223 38 329

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Return to Isaac @ -185 38 411

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Go to the lake and speak with Danielle @ -155 38 363

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Jump into the lake and find the entrance @ -85 21 315

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Follow the path until you fall down a hole

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Find and defeat Cosmic Star Grunt @ -166 2 288

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Find and defeat the next Cosmic Star Grunt @ -143 7 220

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Find and defeat the next Cosmic Star Grunt @ -60 6 181

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Find and defeat the next Cosmic Star Grunt @ -52 2 302

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Find and defeat the Cosmic Star General @ -56 1 379

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Do /spawn and speak to Professor Hemlock inside of his house next to his lab @ 770 46 882

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Once you have spoken to Professor Hemlock, you will have completed the quest and will receive these rewards: