after you beat Whitney the 3rd gym leader go right of the 3rd gym and your see 2 houses go to the top one and speak to her and see give you a squirt bottle
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you get the squirtbottle at the flower shop and water the tree(which is Sudowoodo)
u can only catch it when u battle it to go to the 4th leader gym and that's when u use the squirtbottle
Use the squirtbottle on it.
In Goldenrod City, after you beat the Gym leader, go to the house above and to the right of the Gym. A lady in there gives you the Squirtbottle.
The same place you find him in gold, north of Goldenrod City. You have to beat Whitney and then get the Squirtbottle from the house behind the gym. Use it on Sudowoodo and he will attack you.