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Do this.
>zigzagoon that only knows belly drum/substitute
Turn 1
>Throw Quick Ball.
>Wild Ditto was caught!
or
>Argh! Almost had it!
>Wild Ditto used Transform!
Turn 2
>Throw Repeat Ball.
>Wild Ditto was caught!
or
>Argh! Almost had it!
>Wild Ditto used Belly Drum!
Turn 3
>Use Repeat Ball.
>Wild Ditto was caught!
or
>Argh! Almost had it!
>Wild Ditto used Substitute!
etc etc. no effort on your end besides throwing balls, so is far superior than false swipe given ditto at 25% health has 33% chance of capture with Repeat Balls.