The top of the line Playmate ball machine is the Playmate PC. It can be used with any controller and has a remote controller that does not require you to be near the machine. This is great for individual or instructional use. The machine can be programmed to shoot random shots that realistically duplicate game conditions.
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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.
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.
I would have a friend send you a suicune, you then send it back, now the best ball would be a repeat ball. well... the BEST ball would be a master ball of course, but... meh.
Net ball.
Ultra Ball