the big building on route 9. the name of shopping mall 9 gives the answr away.
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You can get it at shopping mall 9
In shopping mall nine on route 9. Go to the top of the mall and talk to the miner. he will give you one if you say you know about the thunderstone.
You can buy HP Ups at the Shopping Mall 9 on Route 9.
Talk to the worker guy on the top floor of the Route 9 Shopping Mall. He will give you a Thunderstone.
It is in the Northeast side of Veilstone City