You need to beat the gym in goldenrod then go to the flower shop right next to it.
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you get the squirtbottle at the flower shop and water the tree(which is Sudowoodo)
After you beat the Goldenrod City gym, you need to get a watering can from the building next door. Use this on Sudowoodo and you will be able to battle it.
you must water it using either the squirtle bottle, or the water pail, then it will reveal it'self to be a pokemon!sudowoodo
yes trade with a friend
get the sprayduck from golden rod flower shop and water it.