Mega Aggron's biggest issue IMO is its movepool. It works well on regular Aggron because Rock Head and a Rock-type makes it a terrifying attacker in lower tiers thanks to a free Head Smash.
On Mega Aggron? You have a wall with an offensive movepool and almost no way to take advantage of a switch it may cause. No recovery, no utility (bar Stealth Rock and a nerfed Thunder Wave), nothing.
It's better to leave it on lower tiers so that it can go back to outclassing Mega Steelix on its roles.
On Mega Aggron? You have a wall with an offensive movepool and almost no way to take advantage of a switch it may cause. No recovery, no utility (bar Stealth Rock and a nerfed Thunder Wave), nothing.
It's better to leave it on lower tiers so that it can go back to outclassing Mega Steelix on its roles.