in Goldenrod city in a little house that's surrounded by flowers there are two girls. One of them will give you the squirt bottle, but you need to beat the gym leader first and have your first 3 badges.
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In Pokemon Gold, the squirt bottle item can be obtained from the flower shop in Goldenrod City. It is only available to the player after the player has defeated the Goldenrod Gym.
It is very simple to use the squirt bottle. First, find the sudowoodo, who is the one you want to squirt. Press A on the 'tree', and it will ask you if you want to use the squirt bottle, and that is about 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.
defeat the third gym at goldenrod city then go look for a girl near the shaking tree at route 36 then talk to her then she will gone off then you go to a house beside the gym go in then talk to a girl in a red clothing then she will give you a squirt bottle
i dont no maybe u shoud search it on the INTERNET