Niggachu
A black shiny pikachu that inhabits the Kanto ghettos.

Its moveset consists of:

Rap Swag

Steal Run

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.