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You'll need to get to Goldenrod City via Ilex Forest (entered from Azalea Town). Once you have beaten Whitney, you can talk to a girl by the Sudowoodo, who says to go to her house in Goldenrod and ask her sister for the Squirtbottle. This is the house next to Whitney's gym.
Then you will be able to use the Squirtbottle on Sudowoodo.
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