hey guys, wondering if you could give me some help.

im new to the breeding game and since lefvanny was a bro last gen, and since my friend had a FS of him im trying to breed the perfect 5 IV sweddadle

ive been at it all day, and have gotten somewhat good results, one with attack and speed, and the other with sp def def and hp. but now all of their children are comming out sub par, or with atack speed and defence. ive got the destiny knot on the attack and speed one but is that wrong?