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Old January 18th, 2013 (1:30 PM).
Hikamaru Hikamaru is offline
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  • Platinum Tier
 
Join Date: Mar 2011
Location: Australia
Age: 25
Gender: Female
Nature: Quirky
Posts: 49,786
It's called a "critical capture", and it happens randomly but the actual probability has not yet been calculated.

Most critical captures usually catch the Pokemon successfully but there is still a chance of it escaping from the Poke Ball.

So yeah, question answered!
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