If you want only offensive moves these are the best choice: Shadow Ball, Brick Break, Earthquake, Rock Slide.
Aggron cannot learn Iron Head in Pokémon Emerald because it (Iron Head) didn't exist in Emerald.
lairon evolves to aggron at lvl. 42 and aggron does not evolve
Diamond.
Aron-->Lairon-->Aggron
Aggron doens't learn rock slide in this version
This Pokemon evolves at level 42...
he has skamory,Metang/'Metagross,Amarldo,the cradilly and aggron.
yES! Aggron does learn horn drill. Get it At the move tutor at fallarbor town (you give hi a heart scale in exchange)
Aron evolves at level 32 to lairon and Aggron at Level 42
The best moves that fit a aggron very well are metal burst, metal claw, hyper beam, then you could either teach it protect or some other defensive move or go with another power move like iron tail, it works very well.
it evolves into a aggron at lv 42
Aaron to Lairon at lvl 32, Lairon to Aggron at lvl 42.