If you are asking why his Special Attack did not go +30 when you leveled him up, that's because that is not how it works. You see the results of it all at level 100.
With a neutral nature
Ev-Trained Special Attack: 294
Ev-Trained Special Attack: 357
So while he levels up, you will see +1, +2, etc. Don't expect +100. You were most likely doing it right the first time.