PokéBase - Pokémon Q&A
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Please don't question my curiosity.

Why don't you want us to question your curiosity? :/
I reserve my right to privacy.
When breeding in all versions of the game, IVs are generated randomly from the IVs of the parents. Any items given to the breeding parents influence what IVs the offspring will have, however, it is still random.

|| Example as follows ||
Pokemon A
HP: 31
Attack: 31
Defense: 0
Special Attack: 31
Special Defense: 31
Speed: 31

Pokemon B
HP: 31
Attack: 10
Defense: 31
Special Attack: 0
Special Defense: 25
Speed: 31

If you were to breed these Pokemon together, and lets say you gave one of them a destiny knot, you would have an offspring that would have 5 guarenteed IVs from the parents. That doesn't specify which IVs will be passed down, just that 5 IVs total plus one random will be passed down.

The way the power items work (I'm pretty sure anyways) is that instead of guaranteeing that 5 IVs will be passed down (like with the destiny knot) it instead guarentees the one IV that the power item is designed for. I've never tested it with both parents having the same item but I imagine the effect would be the same as you cant guarentee the same thing twice.
So in your example, if both parents held power bracers, then what could the childrens' physical attack IVs possibly be?
Moving this post to a comment at the asker's request, as it doesn't resolve the question fully. Feel free to repost as an answer if you're able to provide the full detail requested in the original post.

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OK this is how it works. If you give both parents the same power items(like both parents hold a power bracer) the attack IV that is passed down has a 50/50 chance of being one of the 2 parents. If they hold different power items, there is really know way to confirm what IVs will be passed down, as only one power item works at a time. for anything, there might be a chance that the IVs the offspring gets are completely different from the parents

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Do you have a source?