You can pass at least 3 IV's The Power item guarentee's one specific one being passed. And then the other IV's are random, which mean if you have a perfect IV parent 31,31,31,31,31,31
Then the offspring, will defnitly inherit 31's in 3 stats.
The other IV's are unfortunately random and can't be influenced. Which simply means you have to breed alot of eggs to have a good chance of finding a pokemon with 31 in the key stats and 25+ in the others (removing a stat which isn't used ofcourse)
Black FC: 2666-8397-4718 Author of the Starfox Story on the Starfox Assault board. Check it out! Don't Fear the Reaper