Hi, it depends of what you prefer for your zapdos. I can breed some flawless pokemon with it ha, I have a flawless latios and landorus that can make a friend of mine clone. Have some flawless pokemons ready for battle with evs and moves.Tell me what you want, if you want something else ask for it maybe I can help.
I can give you a HA Chespin in the ball you want, but we still have that pending trade.. the 5 IV snorunt with spikes for that dive ball female omanyte with HA.
If you do not want to breed it you can transfer the Omanyte to me and I will breed it, then give the original (or a better IVd one) back to you. This post can be a proof of this agreement.
Use this IV calculator (it's what I always use, very accurate). All you have to do is select the pokemon, choose its nature, change the default level to the level of the pokemon, and write out its stats in the space provided. Very simple and easy. :)