Disclaimer: I'm definitely not an expert here so if anyone knows more than me please correct anything I say that is wrong. Mostly I'm just summarizing info from bulbapedia and other sources.
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Whenever you breed pokemon the IV's of the egg will be determined like this:
- 3 IV's inherited from parents at random
- 3 IV's not inherited will be randomly generated from (0-31)
If one of the parents holds on EV-enhancing item (e.g - power anklet, power bracer, etc...) then the corresponding IV will be inherited from the parent. If both hold an EV-enhancing item however it will only be guarente