you have to get to golden rod city and after you defeat the gym leader, there is a house right besides it, go in and talk to the lady, she'll send you back to the gym (a time waster) then the gym leader sends you back, the lady in the house will give you a squirtbottle, then go back to the tree and you'll fight it, then do what you please, fight or catch it
you get the squirtbottle at the flower shop and water the tree(which is Sudowoodo)
You need to beat the gym in goldenrod then go to the flower shop right next to 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
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.
Once beating whitney, you get the watering can, water it XD
which game? silver, gold, crystal, you get it from a man standing northeast of Goldenrod city past the Sudowoodo.
you need to use the wailmer pail on it. it will not like that and it will then attack you. it is the Pokemon Sudowoodo. which means you can also catch it.
get a Pokemon with a ressisstance
go back to goldenrod flower shop and get water pail sprinkle it on sudowoodo
You spray it with water from the flower shop in Goldenrod. The shop is the street above the medical center and then you go right.
nerd
Use your watering can on it. The shaking tree won't like it and it will be a Sudowoodo try and catch it then you will be able to get into Smeargle Cave.