Beat gym leader Wake and go into the Great Marsh once you go in there should be a girl to the right of your talk to her. Hope I Helped!
The HM dive cannot be acquired in Pokemon diamond.
HM05: Defog ( Clears deep fog.)
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)
first of all there like ten Hm
The HM strength
Bibarel + SkuntankorBibarel + Drifblimthere is no hm slave
hm 5 is defog and you can get it from the great marsh in pastoria city as soon as you walk in go to the left and talk to the person with green hair and he will give it to you
There is no HM called dive in Pokemon Diamond you fat oaf.
HM05: Defog
its suppose to be surf
Celestic Town
as far as i know there is 8 hm's please be more specific