you can't noob
Water it with a watering can!
subowudo is a fine Pokemon to have but if you want one on emerold you just have to find anothe Pokemon that sutes(not spelled corect)you like maybe a rayquazqa but there is no possible way to get sudowudo on emerold but on pearl, diamond,platinum there everywere im sorry but if this helped great?
I'm sorry you have to trade from emerald or FireRed/LeafGreen
Route 221
fight, beat sudowudo, go to guy just to the right, he has it and will give it to you only after you beat sudowudo
Route 220 and 220.
1 its called squirt bottle. 2 just press the a button
Route 221 near the Pal Park.
you beat the game and go to the battle frontier and go all the way to the east by the battle pyramid and surf to the land across from and you will see the "strange tree" water it with the wailmer pail and you fight it
go to route 36 and talk to the guy in front of sudowudo
you water it with a squirtle pail and try to catch the sudowudo
You go to the flower shop, to the right of the gym, in Goldenrod and get the Watering can. Then you go up to Sudowudo and click "check". It should ask you if you want to use the Watering can. Say "yes". And if I were you, I would catch him.