What is expected of Mega Aggron in VGC (EVs) ?

Question

I have a Chandelure that can take out a mega Aggron with no Sp.Def, but can just barely not take it out if it had max (nature included) Sp.Def. Obviously a Mega Aggron wouldn't use a SpDef nature, but do Aggron users typically invest in SpDef?
If you could include an entire set that would be great too.

Comments

The sp.def investment is usuallu staple, to make it a more well rounded wall/tank.

Answer 1

Mega aggrons generally prefer Impish or Relaxed (trick room, also makes aggron us slower than Aegislash). Since such aggrons like to spread status like t-wave and toxic, a bulky spread is suggested:
248 HP/ 252 Sp.Def/8 Def

Offesive variants prefer Adamant or Brave natures. Recommended set would be something like:
252 HP/252 Atk/4 Def (with 0 IVs in speed if trick room, but good IVs if Rock polish).

Hope I helped!