It is at the top of the lost tower. An old lady will giv it to you.
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youdon't defog is a hm move that is in Pokemon diamond, pearl, and platinum
You need the HM Defog which is in the Safari Zone. Then you need to teach it to a flying-type Pokemon on your team (it is a flying type move). Keep this Pokemon in your party and you should be able to get past the grunts
there is no dive in diamond,pearl,or platnuim.just cut,fly,surf,strength,defog,rock smash,waterfall,and rock climb.
The HM move Defog allows the trainer to clear the road ahead of any mist or fog. The fog makes it hard to see where you are going in the game, and also lowers your Pokemon's accuracy in battle. The move Defog in battle lowers the target Pokemon's evasiveness. HM05 Defog can be learnt predominately by Flying-type Pokemon.
I suggest you bring a Pokemon that has the move defog,and then use defog to see better while in the cave.