in which Pokemon game? if it's heartgold and soulsilver, you have to beat the game first by beating the elite four and champion. then, you can go to the kanto region and you can find celadon on the map i think.
You can't go to Celadon city in Pokemon Pearl. Its from an earlier region.
Gary does not appear in Celadon City.
In the bottom floor of the Celadon Mansion.
Obviously it's in Celadon City.
Celadon city
Celadon City
No, there is not a PC in the Celadon Gym. However, there is a PC in the Pokemon Center in the farthest north-east corner of Celadon City.
Pokemon mart in Celadon City
Because there's water in celadon city if you use fishing rods in the water you can actually find pokemon!
Its directly west from saffron city.
you go to celadon city
celadon city