No. You can only get the HM for defog in Pokemon Diamond, Pokemon Pearl, and Pokemon Platinum.
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defog is not in emerald,
youdon't defog is a hm move that is in Pokemon diamond, pearl, and platinum
You can't. Only for Pokemon Diamond and Pearl
Since defog didn't exist in that game, you can't. Besides, it's only in one place in RSE, You'll survive.
there is no defog in pokemon black/white