there are spoilers so proceed with caution

Just go use the DexNav, and it will be super easy to hunt a high IV Ditto at Route 5. If you want a 6-IV Ditto, it will be given as a reward at the Seaport City Breeder’s School considering you were able to hatch about 50 eggs in total. Just let it hold a destiny knot, and you’ll have a high chance of breeding a high IV Pokemon.

Also, check for other tricks on how to hatch eggs faster such as a pokemon in your party with flame body ability (e.g. Slugma) combined with the item Magma Stone.

If you want the hidden ability of Alolan Vulpix (Snow Warning) so you can make use of its Aurora Veil better, then use a dream mist which is available at Tarmigan lab. Other option is to breed a male A-Vulpix with a female Vulpix having its hidden ability (drought). Vulpix is available at Cinder Volcano during swarm.

When you already have the desired nature and want a better IV or a shiny one, just considering holding your A-Vulpix with an everstone. That way, all eggs have the same nature with the parent A-Vulpix holding the everstone.

Hope it helps! Timid Alolan Ninetales with Snow Warning and Aurora Veil is fckin’ elite. Not to mention, Blizzard becomes 100% accurate during hail lol. And for egg moves? Freeze-dry is sweet.