you get defog in the great marsh. Once you enter look for a person that looks lie a cooltrainer , you should see him straight away. Talk to him and hell give you the defog hm.
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No. You can only get the HM for defog in Pokemon Diamond, Pokemon Pearl, and Pokemon Platinum.
youdon't defog is a hm move that is in Pokemon diamond, pearl, and platinum
There is no HM Defog on Ruby, it came available in the 4th generation which is Diamond, or Pearl.
you get hm strength and hm defog after defeating two gym leader.Fantina(defog) Byron(strength).
It can be found in the Solaceon Ruins.