in nimbasa at one of the buildings, you see an ace trainer. he will give you strength.
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Nimbasa city, it is from a boy in a house.
From a man in the building northwest of the Pokémon Center in Nimbasa City.
Correction: it is an HM, but it is in Nimbasa City. The house behind the Pokemon Center, a blue haired guy will give it to you.
No, it is a version exclusive to Pokemon White. You'll have to trade it from someone who has that version.
RegiRock