Pokémon breeding/Games/How to breed/Inheriting stats/Generation IV

Inheriting IVs in is determined in the same way as in.

From onward, the baby will inherit three IVs, each from a different stat and from a random parent.

From onward, if either parent holds an EV-enhancing item (excluding the Macho Brace), the baby will instead receive the IV of the corresponding stat from that parent, then inherit two other random IVs each from a random parent; if both parents hold an EV-enhancing item (excluding the Macho Brace), the baby will inherit the corresponding stat to their held item from one of those parents at random. For example, if a parent is holding the Power Anklet, the baby will inherit the IV from that parent, and it will also inherit two other different IVs from its parents, such as Attack and Special Defense. As another example, if one parent holds a Power Anklet and the other parent holds a Power Weight, the baby will inherit either the Speed IV from the first parent or the IV from the second parent, and it will also inherit two different IVs from its parents other than Speed or HP (whichever was successfully inherited will be the one not chosen).