Is there a quick way to obtain a perfect Yveltal?

So far Yveltal is probably my favorite legendary, I'm attempting to legitimately catch one with IVs I prefer.
I have a theory, please help me validate it, that using Nintendo's app that transfers save data to the SD/microSD card I save before my encounter with Yveltal, and copy my data on to another SD card(I know this part works from experience) as a back-up, then I use one the save data from one card and catch, and transfer Yveltal over to AS to quickly check the IVs, if fail overwrite the save(because of the annoying auto-save) with the back up and continue.
I realize that this would be a major exploit because of the obvious duplication, which is why I'm afraid of testing it myself, and I am not intending to duplicate. I'm sure there's a much better, shorter, and sweeter way to go about this without saving that I'm not thinking of, if you have one such method it would be appreciated!
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What is the easiest way to catch Yveltal?
Xerneas and Yveltal are two of the Legendary Pokemon you can catch in Pokemon X and Y....How to Catch Xerneas and YveltalWhat are the chances of catching Yveltal?
#4 - Yveltal Yveltal also has a catch rate of 45, which equates to 11.9%. It is exclusive to Pokemon Y, but can also be found in the Ulta Space Wilds of Pokemon Ultra Moon. This is an incredibly high catch rate for a game mascot.Why is Yveltal so good in Ubers?
It is one of the best users of Life Orb in Ubers thanks to its strong signature move, Oblivion Wing; it is also able to pull off a dangerous bulky set due to its access to Roost and Dark Aura-boosted Foul Play. Yveltal also has access to the strongest priority move in the game, Dark Aura-boosted Sucker Punch.Was Yveltal really good?
Yveltal is really good. In fact, it is amazing in PvP. It only has issues in PvE, but I'll come to that later. Yveltal's high ATK stat, impressive DEF and humongous HP naturally make it s Pok\xe9mon tailor-made for the Master League meta.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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