No point in training in Special Defense. It's a bad stat to begin with, and even with 60 extra points added to it, it'll still suck, and is worth investing in Agrron's Strong Points. Plus, with that Hasty nature, your Defense will want some serious TLC.
This would be my recommendation:
/ 252 Defense / 248 Attack / 8 HP /
Aggron won't last long against a potent Special Attack, but he's a tough cookie as a Physical Tank, so don't bother trying to achieve the impossible. =D
EDIT: Ouch, a Hasty nature? - Defense, + Speed, huh? That's not too bad, but it doesn't really help much either. Anyway, teach it the following, for a good moveset:
Iron Head (Reliable STAB)
Metal Burst (Think of it as Counter / Mirror Coat / Bide -esque, but without the worry of prediction)
Thunderpunch / Rollout / Outrage (All three are Move Tutor moves, but Thunderpunch rids of Water-types, Rollout for a murderous STAB, or Outrage for just...complete and utter wrath xD)
Earthquake / Thunder Wave / Avalanche (Earthquake because it's Earthquake, Thunder Wave to compensate for low Speed, or Avalanche to take advantage of low Speed along with an answer to Ground-types)