I've spent the last couple of days trying to breed a 5 IV Aeigislash and it's starting to wear on me. I have one with HP, Atk and Def and I'm trying to ge Sp Def and Sp Atk from 2 different dittos using power items, but it is taking forever

I've tried the exploit method that involves soft resetting the game after each egg, but that seems to take even longer. So now I am just filling my party with eggs and hatching them all at once.

tips? advice? am I doing this right?