No. Again, the only thing that affects your EVs is the type of Pokemon you defeat. Exp and leveling up does absolutly NOTHING to your EVs.I'm sorry I am just getting confused by all this. I am taking the easy rode and using a Ev calculator and my Garchomps speed is supposed to be at 169 after I input the EV's and IV's. Won't it mess it up by leveling up and EV training ti at the same time?
For example in the case of your Garchomp, as long as you have 252 Speed EVs on a +Speed nature Garchomp, you will have 169 Speed at Lvl 50.