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.
It is located in the bottom-most row in the low city.
If you complete the pokedex you can get a diploma from game freak in the celadon mansion in celadon city and you can now say to everyone you did it!
There are many Pokemon that you can have. You just have to switch them out in the PC when you want to.
after beating the 1st gym head over to heart home city there is a gym there go inside if you want to get to the elite four!
you can get it online
Pokemon have to level up in battle not in the PC. of coarse some evolve with in item or trade or both but the only thing the PC is good for is storage.
in Pokemon fire red they don't. they just wont hatch
After beating the 1st or 2nd gym leader you will get a call from elm. Go to the Pokemon center put a Pokemon in you PC box and then go to the Pokemon shop and talk to the scientist looking guy.
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You can get the hm dive in celadon city go to the PC and talk to the man with the brown suit and with the brown hat and when you talk to him he will give you the hm dive. In other ways to be easy go to the Hoenn region and go to sotopolis city and go to the PC and talk to the man with the yellow hair and he will give you the hm dive. *THIS DOES NOT WORK FOR FIRE RED OR LEAFGREEN*, since there's no way to get HM08, nor use it in Fire Red!
Why do you want to get rid of pokemon in a pokemon game? That sounds useless... If you mean you caught too much pokemon you go to "PC" (in any pokecenter) and choose release pokemon.
A person can get rid of Pokemon on Fire Red by visiting the Pokemon Center. The pokemon can then be conveniently moved from Ash's backpack and into the PC box.