No, Normal Spell Cards like Dark Hole can only be activated on your turn during your Main Phase 1 or 2.
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The move Dark Void puts its opponents to sleep however in a double battle it'll put both of its opponents to sleep.
No Feint Attack is just the name for the move. Feint Attack is a Dark Type move that never misses when utilized regardless of the opposing pokemon's evasion stat.Feint Attack can faint a Pokemon. It's a pretty good attack, too, with 60 base power plus STAB on Dark-type Pokemon.
He created the dark magician
In order to kill or faint Giratina, you have to attack it however the quickest option to knocking it out would be a dark-type attack however I would recommend to try to use a normal-type Pokémon that can learn a dark-type attack because then Giratina's Shadow Force attack won't work.
No, she can only negate Spell, Trap or Monster effects that Target. Dark Hole does not target anything.