how do i breed defog onto scizor

Question

it says the only compatible pokemon is scizor itself.I'm confused? can someone explain.

Answer 1

Well, Defog in an HM in Diamond, Pearl, and Platinum but not in HeartGold/SoulSilver, so teach Scyther/Scizor Defog in Diamond, Pearl, and Platinum, trade it to HeartGold/SoulSilver, then migrate it over to your White. To breed, teach a Butterfree, Beedrill, Venomoth, Scyther, Gligar, Scizor, Beautifly, Yanma, Dustox, Maquerain, Ninjask, Mothim, or Yanmega Defog in Diamond, Pearl, or Platinum, trade it to HeartGold/SoulSilver, and then migrate. Then breed. Remember, your Scizor MUST be female for this to work.

Answer 2

Teach Defog to a Mothim(Always Male) and put it in the daycare with a female Scyther/Scizor to get an Scyther that knows defog..
Scizor can breed with these pokemon.

EDIT:
In 4th gen, Scyther can learn defog