I usually start with a trash poke but starting with a 5 IV poke is a good start (unless its a Hidden Power with a lot of 30's like HP Fighting or Rock). You breed until you get the right Hidden Power or its opposite (i.e. HP Electric means I got the wrong attack stat when breeding for HP Grass, but still works as a breeding mother). I'd say 2/3 of my HP breeding mothers are perfect/opposite, and the last 1/3 being 4 IV. The 4 IV just take longer to produce viable babies (which are usually male to spite me ;p).
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Just hatched another shiny (#5 for Gen 6), I mean hell I just hatched shiny exeggcute yesterday! (Again Masuda Method but no Shiny Charm)
Female | Volt Absorb
31/1/31/30/31/31 (HP Electric)
And in line with my luck of never getting a perfect shiny, I AM YET AGAIN 1 STAT AWAY FROM BEING PERFECT!!!
But also in line with all my shiny pokes, they are at least still viable. Missed the HP Grass but least T-Bolt is a decent replacement (tho now I'm walled by Seismitoad pretty hard).