>>26843276well, for a 5 iv, it's 1/6 chances, (if you want a specific value for the 6th iv, mult it again by 1/32).
given the nature is passed down with an item, no need to add that. then, you will have the ability. let's say you have everything you need, it's 4/5.
now, you want a shiny, 'cause wynaut ? add 1/512...
-> 1 / 6 * 4 / 5 * 1 / 512 = 1 / 3 840
for a 5iv shiny HA, you should need an average of 3840 eggs.
but, wait, this is an optimistic count, made by using a perfect 6iv ditto and a perfect 6iv HA mother with the right nature.
and, this is for one pokemon, you will need at least 5 more.
SO, I would say, under 15~20k, this is not a huge breeder and under 5k, the team don't come from this game. or... you could ask him to choose lottery numbers for you, who knows ?