How to SR for the Legendary Birds in X?

Question

I'm planning on restarting my Pokémon X and choosing Fennekin so that I can get Zapdos as my Legendary Bird. However, I'm wondering how you soft reset for a 5IV one, since they roam around randomly. Can anyone offer any tips or tricks to SRing for Zapdos/Moltres/Articuno?

P.S. I will be using my Master Ball to save time.

Answer 1

Method for catching Zapdos

After defeating the Elite Four, several Pokémon start to roam the
region, Articuno, Zapdos and Moltres. However, you will only get one:
Articuno if you picked Chespin, Zapdos if you picked Fennekin and
Moltres if you picked Froakie. However, a change has taken place
compared to previous games. These Pokémon will automatically flee from
combat, before you even get a chance to select a move. You can track
their location with the Pokédex. After they have run from you over a
dozen times, they will go to the Sea Spirit's Den where you can
finally battle them.

From Serebii
So you must track Zapdos a dozen times to then find it in the Sea Spirit's Den. There, it will adopt a fix location, perfect for Soft Resetting it.