>>25005259That's not how it works. M-Aggron needs support because unless it can seize
momentum it will simply get blasted.
Ideally what you do is you wear down the other team a little bit, then send out Aggron, set up a fat Substitute when the opponent switches out, then you can Rock Polish and start hitting hard or use Curse, or even Hone Claws, or T-Wave. Then smack them around with two moves of your choice.
Sadly most people choose to just go Smogon Standard and throw this shitter out there mindlessly thinking it'll just tank everything and OHKO back. It doesn't work like that.