Okay if my Pokemon has Pokerus, is holding a power bracer and defeats a horde of Scraggy, how many EVs does he get?

Each scraggy gives out 1 Atk ev = 1x5 = 5 Power braver gives out 4 Atk ev for each Pokemon you KO= 4x5 = 20 Factoring in pokerus would give you (5x2)+(20x2) = 50Atk Evs

Hope I helped :)