You can't. You have to put Pokemon in the blue thing in the Pokemon center (the PC).
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You can sell it to a shop for a very high price.
You can only win one from the Goldenrod Department Store Lottery.If you don't want to go though all of that if you have Pokemon diamond,pearl or platuim you can give it to a Pokemon and trade it to heartgold or soulsilverSome cities sell timer balls in the poke mart. The pokmn League place does though! :-)
i am not quite sure of that one, but if you are really content on getting your hands on an English copy, you could just have a copy imported from the u.s.
The question is odd, since you can't buy or sell Pokemon in the games... so i have no clue what it means
you sell it