So after doing some research I decided to begin EV training. Picking my LARVITAR that I caught at Mount Silver as the target for the training. Being of a Lonely Nature it's Defense is strong and it's Attack is weak.
After about 3 hours of consistent training on Route 40/41 I have now acquired 255 SPDEF EVs. Now I'm going to trot around with my newly evolved PUPITAR (Lv.40 Currently-Started at 20) south of Blackthorn to train it's defense.
My future TYRANITAR will be a heavy tank specializing in DEF and SPDEF stats.
PUPITAR Lv. 40
SANDSTORM | EARTHQUAKE
ROCKSLIDE | STEALTHROCK