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Ecruteak City

After Sudowoodo you will reach Ecruteak City. You'll probably want to stop at the local PokéCenter to heal your Pokémon. 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 Pokémon from older games, and transfer them to Gold or Silver. He tells you that you can't have any new moves from GSC or GSC Pokémon 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.
To find Morty in Crystal, you have to beat your Rival first. He and Morty will be at the Burned Tower. After you do, Morty will return and you will meet Eusine, whom you will battle later on.

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Your Rival Haunter
Lv. 20
Magnemite
Lv. 18
Zubat
Lv. 20
Stage 1 Starter Lv. 22

There is a ghost floor surface which continually has you falling through, but to get to the other side, you must walk directly forward in front of a gym trainer, then walk directly left/right, but before reaching the edge, walk directly up in front of another trainer. Here is a Map

The Gym Leader uses all Ghost Pokémon so a Psychic like Kadabra or Drowzee will come in handy here.
Morty will give you the Fog Badge for winning. All Pokémon up to level 50 will obey you now and you'll be able to use Surf outside of battle. He will also give you TM 30, Shadow Ball.
Morty Gastly
Lv. 21
Haunter
Lv. 21
Gengar
Lv. 25
Haunter
Lv. 23

There are 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 all of them at Lv. 17. Should be Easy. When you defeat all five and talk to the man with the hat, he will give you HM03, Surf.
When You Enter the burnt tower in GS you fight your rival (see above). Once your Rival is defeated and leaves, it'll be time to explore the rest of the tower.
If you taught TM08 to one of your Pokémon, now it is time to use it. (Remember TM08 is given to you by the man that was looking at Sudowoodo in Route 30) 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, You may run into them later on in the game, so be prepared. Suicune on the other hand for crystal will be dealt with Later On
Raikou
Lv. 40
Entei
Lv. 40
Suicune
Lv. 40

Next Head Of West To Route 38. Follow the path down and you'll eventually get to Olivine City


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