you must first obtain a wailmer pale which is in the pretty petal flower shop right outside of rustboro city. go out to the tree and press a it will ask you if you want to water it say yes and it will become anrgy and battle you it is actually a sudowoodo at level 30 make sure you stock up on ultra balls and try to catch it save before you talk to it because it is the only one in the game good luck
That i right, also if you want another sudowoodo just put it in the daycare with a ditto (to get a ditto either trade it from firered or go to the fossil maniac's house and go into the cave and there are loudread and ditto there) and they will have eggs :)
Actually, when I battled it in Emerlad, Mr. Firstanswerman, it was Lv. 40.