Pain Split? What would happen?

Question

Does the move "Pain Split" work if both Pokemon are at full health?

For instance if a Dusknoir with 290 HP used Pain Split on a pokemon with more HP than Dusknoir (and both pokemon are at full HP) would the opposing pokemon's HP become the same as Dusknoirs?

Answer 1

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Pain Split adds the current HP of the user and target Pokémon. It then divides this value by two and sets the HP of both Pokémon to the result. If the new value is higher than the maximum HP of either Pokémon, that Pokémon will have its HP set to that maximum.

Bulbapedia

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Pain split averages the Pokemon's HP. So yes it would end up with equal HP. This is why Pain-split is good on Pokemon with High Defenses and low HP.