you dont, you have to find them with itemfinders or in pokeballs. same with elixers, once you find them, you dont get any more.
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You can find ether in pokeballs. Just look for pokeballs and you will find.
I don't think you can; you have to find them
Probably @ the pokemon dept. store in lillycove.
buy them
Ether is a very helpful item that none of the pokemarkets sell. You only way of having an ether is by finding it. An itemfinder is most useful.