Defeat the Goldenrod Gym Leader, Whitney. After you've claimed your badge, enter the flower shop to the right of the gym and talk to the girls in there. One of them will give you a squirt bottle. Go to the tree and use the squirt bottle on it. The Sudowoodo will attack you and you can either kill it or catch it. If you don't catch it you can always make it come back by defeating the Elite Four.
With a pokeball
By using Headbutt on a Tree.
It let's u battle Pokemon hiding in the tree
You find it after you fight the wiggly tree.
In the tree house route on the poke walker
you get a watering can in the goldenrod flower shop and then go talk to the tree
Headbutt allows a Pokemon to literally 'headbutt' a tree. Basically, it allows the Pokemon to smash its head into a tree. Sometimes, nothing may come out of the tree. Other times, Pokemon (Like Pineco) may pop out to battle you.
well you can't them off tree's you have to grow them in the berry pots
i got my heracros in soulsilver by headbutting a tree directly behind kurt's wht apricorn tree in azeala town, it was lvl 3
youbeat whitneythan get that watere thing from the store in goldenrod than water the tree
You cant, unless you use headbutt on a tree, get a pineco, and evolve it to foretress.
you water it with a squirtle pail and try to catch the sudowudo