The best pokeball for its capture is the Watermelon Ball which can catch it without a battle 100% of the time which is recommended if trainer don't want their wallet gone and Niggachu to escape.
Ash is walking in the hoods when a wild niggachu appears...
Ash:Look Misty, a niggachu!
Misty:Do you have any Watermelon Balls with you Ash?
Ash: No, I'll try to catch it the normal way...
Niggachu used Steal, pokemon trainer wallet was stolen.
Ash:WTF niggachu!?
Niggachu used Run.
The greatest team ever created in the history of competitive pokemon. It is a monowater team in bw that has never lost a tournament match. It is likely that this team will never lose as god blessed it with the ability to power through any match up. The legitimacy of these statements is 102% accurate with a 2% margin of error.
I got swept by niggacannon for the 19th time this past minute. I will now proceed to hang myself.