you get it at the great marsh and talk to the green haired guy
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whirlpool is not classified as a HM in that Pokemon series, only in heartgold/soulsilver is it a HM, in diamond it is only a simple TM (1use)
The move Rock Tomb is a TM, not a HM.
in veilstone city the team galactic warehouse the HM fly will be their.
you get hm strength and hm defog after defeating two gym leader.Fantina(defog) Byron(strength).
you do need hm waterfall for mt. conet.There's a waterfall in mt.conet