Celadon City is the second-largest city in the region, and it's got plenty going on to live up to the hype. The Celadon Department Store is an essential stop, since almost anything a Trainer could want is up for sale here. The Celadon Mansion is a hotel-of-sorts, and the current tenants are none other than Game Freak, the team that developed Pokémon. The Game Corner houses the slot machines, and those coins can be redeemed for valuable prizes in the Prize Corner next door. In addition, Celadon is also home to the Celadon Gym, nestled on a hill in the southwest.
The tall building in the north of town is Celadon Mansion. On the third floor, Game Freak's game designer promises a reward for showing him your completed Pokédex. Incidentally, you can find a new addition right now; leave the mansion and follow the path behind the Pokémon Center to find a break in the trees where you can enter the mansion through the back door. Make sure that you've got an empty slot in your party, and take the stairs to the top floor to find an Eevee. Eevee is an extremely versatile creature, since it can evolve into one of three different forms. Exposure to a Water Stone, Thunderstone, or Fire Stone results in a Vaporeon, Jolteon, or a Flareon, respectively. Any of those three evolutions will make a powerful addition to your team, especially since they can cover the weaknesses of your starter's final form. These stones can be purchased only in the Department Store.
If you haven't noticed by now, there are two Rocket grunts loitering around the city. It looks like Team Rocket has something planned for Celadon...
Stop by the café in the south of town and talk to the guy in the back corner. He lost all his money at the slots, so he has no more use for his Coin Case, and hands it over. Next door to the café is an operation that is shipping 2,000 Pokémon every month to the Game Corner as slot prizes. Those kind of numbers mean big money, and that's got Team Rocket's name written all over it. They're up to something, and as one of the workers points out, it surely has nothing to do with a hidden switch behind a poster in the Game Corner.
Each Vending Machine dispenses Fresh Water, Soda Pop, and Lemonade. Buy one of each drink to give to the little girl nearby, and she'll give you up to three TMs as thanks - TM13 (Ice Beam) for a Fresh Water, TM48 (Rock Slide) for a Soda Pop, and TM49 (Tri Attack) for a Lemonade. Pick up an extra drink for the guards at Saffron City's borders, and stock up on Lemonade. Like the other drinks, Lemonade can restore your Pokémon's health, but Lemonade is the most potent. It restores 80 HP, while by comparison, a Super Potion only restores 50 HP.
CELADON CITY POKéMON GYM LEADER: ERIKA
The Nature Loving Princess!
The Celadon Gym specializes in Grass-type Pokémon. This will likely be one of the easiest Gyms to defeat, as Grass Pokémon have multiple weaknesses. These plants fare poorly against Fire-, Ice-, Flying-, and Bug-type attacks. The majority of Pokémon here are also part-Poison, which adds a weakness to Psychic moves. While your own Grass Pokémon take less-than-normal damage from Grass attacks, they need to be careful of Poison moves like Acid. If you haven't used TM13 yet, Ice Beam can be a great help.
All the prizes here are offered at extremely high prices, so you'll need a huge supply of coins to get everything. A few can be found dropped on the ground, and talking to the other gamblers gets you some more. Besides that, you can either buy them—50 coins for 1000—or take your chances with the slots. Someprizes are extremely rare, while others can be found only here.
At first glance, everything looks normal here. People are relaxed, having fun at the slot machines, but there's something unsettling about the guy glaring at the poster... As soon as you approach him, he picks a fight with you.
He runs off, leaving the poster exposed. Examine it to flip the switch, which reveals a set of stairs nearby, and descend into their hideout.
Team Rocket is headed by a shadowy figure known as Giovanni. This mob boss is in possession of the Silph Scope prototype, which can identify the ghosts back in Pokémon Tower. It is impossible to get past the spirits without that item, so make sure he doesn't escape with it!
The key to confronting Giovanni in his office is exactly that—a key. The Lift Key that operates the elevator is on the fourth floor beneath the Game Corner.
This floor is the first area that you encounter spin tiles; these send you spinning until you land on a stopper tile.
Enter the maze, and follow the spin tiles to the stopper tile in the northwest. Backtrack to get the Nugget from the northeast corner. On your way south you'll find a Moon Stone, TM07 (Horn Drill), and a Super Potion. Climb the stairs to the east to find two more Rockets and a Hyper Potion, then backtrack through the maze and head down the northern stairs.
Go south past the lone Rocket to get TM10 (Double-Edge), and the hidden Nugget nearby, then enter the second spin tile maze. This one isn't as large as the last, so spin around a little and grab the Rare Candy on your way south. Beat up the Rocket here and go downstairs to B4F.
One quick battle and the Lift Key is yours!
When you first reach B4F, you can only reach the two rooms on the west side. Walk south to find an HP Up sitting on a table, then check out the northern room. By the far wall is TM02 (Razor Wind), and to the north, another Rocket.
Talk to him after the battle, and he's so upset that he drops the Lift Key. Now climb back to B2F and spin through the maze one last time to reach the elevator in the southeast. Ride back down to B4F to reach the east side.
When you exit the elevator, go west to find an Iron. Take out Giovanni's guards, then step inside to confront the criminal mastermind. His Onix and Rhyhorn are both susceptible to Grass- and Water-type moves, while his Kangaskhan is vulnerable only to Fighting-type attacks.
After the battle, Giovanni and the other Rockets disappear. Pick up the Silph Scope that he left behind; now you can climb to the very top of Pokémon Tower. Take the elevator up to the first floor, and beat one last Rocket on the way out.
Now you can finally leave Celadon. Bring along that extra drink and head east to Route 7. Step inside the gate to be stopped by the guard. He automatically sniffs out the drink, and as he shares it with the other three guards, you are now free to come and go through Saffron City. The Saffron Poké Mart offers the powerful Max Repel, and it may be a good idea to buy a few for the haunted tower. Ignore the rest of the city for now, and continue east to Lavender Town.
By this point, he has assembled a team that includes Grass, Fire, and Water Pokémon. In addition to his starter Pokémon, the others that make up this trio may be either Exeggcute, Growlithe, or Gyarados; whichever is absent is the same type as his starter. These new additions have forced him to swap out his Raticate, so its Hyper Fang is a thing of the past.
His Pidgeotto, despite leveling up and learning a new move, is still not much of a threat. Exeggcute can cause problems with its Sleep-inducing Hypnosis, but its Barrage has relatively low power. His Growlithe is still just a pup, and cannot deal serious damage yet. Gyarados' high Attack makes it a decent threat, so take the sea serpent down quickly with Electric or Rock attacks. His Kadabra can inflict decent damage with Confusion, but its other moves are no real threat. His starter has grown to level 25 and learned some new moves, but play to its weaknesses to take it down with little effort.
Grab the Escape Rope by the north wall and climb the stairs to 4F.
Pokémon Tower, 4F
Pick up the Elixer and Awakening in the center of the room, and the HP Up near the south wall. Climb the western stairs.
Pokémon Tower, 5F
There is a Channeler in the center of the fifth floor that hasn't been possessed, and she maintains a healing area with her white magic. This protected zone will fully heal every Pokémon in your team, restoring health and eliminating any status problems. This can be done at any time.
Pokémon Tower, 6F
As you approach the stairs to the top floor, the ghost attacks and the Silph Scope activates, revealing a level 30 Marowak. It may look like a great addition to your team, but this spirit can't be caught, so all you can do is defeat it. Once the battle is over, the mother Marowak's spirit is calmed and departs to the afterlife, finally able to rest in peace. Take the stairs to the top floor... right into a group of Rockets.
Pokémon Tower, 7F
Marowak's soul is calmed
After they run off, talk to Mr. Fuji and he'll take you to his home, Pokémon House, at the foot of the tower.
Mr. Fuji's house
Speak with him again and he'll give you the Poké Flute, an item that instantly awakens any sleeping Pokémon. This lets you rouse the two Snorlax, west of Celadon and south of Lavender.