I am not sure about the best ball, but here are some ideas: Master Ball, Cherish ball, Ultra Ball, Luxaray Ball. If none of these work knock it out.
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no you do not
The best ball to catch Giratina is the Master Ball but the next best and effective options would be the Dusk Ball or the Ultra Ball.
Net ball.
the ultra ball is what i used to catch it...but you could use the master ball after you get it
buy 5 ultra balls 5 timer balls and 5 dusk balls. cresselia is at the top the mountian. GOOD LUCK!