After Sudowoodo you will reach Ecruteak (Enjyu) City. You'll probably want to stop at the local Pokecenter to heal your Pokemon. When you do you'll meet Bill. He'll tell you he just finished fixing his Time Capsule. The Time Capsule will let you transfer Pokemon from older games, (Red, Blue, and Yellow) and transfer them to Gold or Silver. He tells you that you can't have any new moves from Gold and Silver or Pokemon when trying to use the machine. Then he'll leave and go back to Goldenrod City where he'll give you an Eevee if you talk to him again.

After this, you can take on the local gym leader, Morty.

It would have been handy to have a Kadabra by now.

Two more things to do here. Inside the town there are five Kimono Girls dancing on the stage. Each Kimono Girl has an Eevee evolution (two new ones, a Psychic one, and a Dark one). If you defeat all five and talk to the man with the hat, he will give you HM03, Surf.

Inside one of the houses, this guy will give you an Itemfinder.

Once you enter the Burned Tower your Rival will fight you. If you have that Kadabra, now is the time to use it.

Once your Rival is defeated and leaves, it'll be time to explore the rest of the tower. I was playing at night, so I fought some Rattata, the occasional Gastly, Koffing, and Magmar!

If you taught TM08 to one of your Pokemon, now it is time to use it. (Remember TM08 is given to you by the fat man that was looking at Sudowoodo - the wiggling tree.)

Fight the trainer and you can fall down the hole in the middle. Go up to the stone statues and they will awaken, then scatter. These are the Three Legendary Beasts, Raikou (electric type), Entei (fire type), and Suicune (water type). You may run into them later on in the game (in the wild), so be prepared.

Next head west to Route 38.

Inside the Burned Tower you can find TM 20 by breaking the rock on the right side. Then you have fall in the hole in the upper right hand corner. Then move a rock with strength and TM 20, Endure, is yours.