I was breeding Pidoves to try some IV breeding. I had a 2 IV male with Attack and Speed and a female Pidove with Speed IVs. The male was holding a Destiny Knot and female was holding a Power Anklet. I got a female Pidove with 1 IV in Speed.
Have I done something wrong?
Destiny Knot IV breeding only works in X/Y so if you are using it in previous gens then it won't work. But if you ARE using the Destiny Knot in X/Y it only passes 5IVs from either parent so it doesn't always transfer the IVs you want, so you have to rely on chance.
Source: Experience
As far as I can tell, you did nothing wrong. The destiny knot transfers 5 random IVs from the parents to the offspring, I guess it was just bad luck this time.
Source Hope I helped.