>>48034350Pure steel? Look at how Registeel and Copperaja get played. A pure steel aggron would function something similar to the two. Performance wise, I think that Ferrothorn, Empoleon and Registeel would be considered over it.
Mega Aggron got played. He wasn't as popular as other megas like luc, khan, lop or the zards. He had his fans though. It didn't help that some of the strongest megas had the type advantage over him. Mega Aggron was as popular as Stakataka. Not played often but still strong.