Somebody's PC is the Pokemon Storage System. This changes if you speak to Bill (whose house is right next to the Pokemon Center in Goldenrod City) to Bill's PC.
PC box
you go to the pc at the pokemon center then you do it from there
put your Pokemon in the PC box at a pokecenter
it always is. but if it isn't you will just have to do the deposit then withdraw thingy.
Put one of your Pokemon into the PC in a Pokemon centre.
go into the pc box, click move. click a on the pokemon, then select release
click on the pokemons summary in the PC and in purple it should say pkrs.
they are then shipped to the PC storage unit at the Pokemon center.
Anytime you could use the poke walker. All you need is a Pokemon in your PC
First, go to a pokemon center, if you have not gotten to Goldenrod city, it will say someone's pc. To get it to say Bill's pc you must speak to bill himself. He is in Goldenrod city at his house. (right) Enjoy using the pokemon pc!
There is Bill's PC that after you catch more than 6 Pokemon in your Party it sends it straight to the PC and you can withdraw your seventh Pokemon after you deposit one of the Pokemon you don't need in your Party
use them to fight, walk with them, don't give them rare candys or leave them in your PC box.