If you mean max, its stats would be:
299 without Choice Scarf
448 with Choice Scarf
Anyway, how many EVs you give it depends on what you want it to outspeed. IMO, rebreed to get one with at least a 28 IV, so it can outspeed neutral base 100s.
Wow, all that breeding and I need 1 more point in speed.
Does that 5 points really let them go before me?