After you leave Azalea Town you'll enter a forest. You'll see a man standing near a cut-able bush. Talk to him and he'll tell you that he lost his boss's Farfetch'd.
After him you will see the Farfetch'd by itself. Chase it around until it reaches the man by the cut-able bush. Talk to the new man and he will give you HM01, Cut.
Now Teach It To A Pokémon (If you dont have one, just walk around until you catch a Paras), Cut that cut-able bush to get passed the only one Blocking your path.
Inside the Forest is a guy who will give you TM02, Headbutt. Headbutt lets you shake the little trees that are everywhere in the game, sometimes revealing sleeping Pokémon. At the End Of The Walkthrough there will be a list of all the Pokémon Found In The Trees.
After cutting the bush that is right before the shrine dedicated to the Forest's protector, you'll wind through the Forest path until you come to one of the Connection Gates. Inside is a girl who will give you TM12, Sweet Scent. It will attract Pokémon to you outside of battle.
Pokémon Seen In The Forest
Caterpie
Metapod
Weedle
Kakuna
Zubat
Paras
G: Common
G: Common
S: Common
S: Common
Uncommon
Uncommon
Pokémon Seen In The Forest In Crystal in Morning/Day
