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 soulsilver
Some cities sell timer balls in the poke mart. The pokmn League place does though! :-)
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You can buy them at the Pokemon mart at the Pokemon league. I buy my timer balls, heal balls, etc. at the Pokemon mart in canalave city
CHEAT
on wednesday, go to the top of the goldenrod department, and do the lottery. it's the 1st prize
you can only get cherish balls on event Pokemon they are not obtainable
you cant there is only one