Mar 1, 2016, 10:21 PM
When breeding, 3/12 IVs from the parents get passed down to the child. When breeding with the Destiny Knot, 5/12 IVs get passed down. No two IVs of the same stat get passed down, ensuring that the child is always going to have 5 IVs if both parents have 6 IVs. The 6th IV is always randomized between 0-31 and has a 1/32 chance of giving the IV you want. So when breeding with two 6 IV parents, there's always a chance that the child has 0 IVs in speed.
The minute you think of giving up, think of the reason why you held on so long.