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 powerful form of a real nigga and the highest most greatest form of any nigga. Niggato can do some real hood shit and he is ready to fight bitch ass niggas at any time
Tyrone: oh shit run here come Niggato!
Niggato: You foolish mortal I have come to defeat the ultimate bitch ass nigga. NIGGATO GO!!!