After the third Gym there was a house right outside the gym. Inside the girl in red will give you a SquirtBottle to sprinkle on the tree. Sudowoodo doesn't like water, so it'll wake up and fight you. Remember there's only one, so be ready to catch it. Its Lv. 20
In Crystal you'll have to go to Sudowoodo before going to get the SquirtBottle
Next head directly to the right and talk to the fat guy that you come in contact with. He'll give you TM08 which is called Rock Smash. This move will allow you to break certain rocks later in the game so don't lose it.
On Thursdays in this area, right above where the fat guy is, Arthur will show up. He'll give you Hard Stone, which will increase that strength of Rock attacks.
