Who gave Croven a trophy wtf!
Can a pokemon like Aegislash easily set up and sweep the entire tier? I deffinatly don't think so. That is a defenition of an uber that is designed to sweep, like Mega Khanghaskhan. In the case of Mega Metagross, it's designed to be a fast and bulky cleaner with amazing coverage to threaten every single mon in the tier. Just because a mon can't set up swords dance and win, doesn't mean it's not broken. If a mon has no counters, and someone has to specifically run multiple checks to it to avoid being demolished by it flat out, makes it broken. Mega Metagross scares away many offensive teams, and certein mons like Mega Pinsir or Terrakion. Having to run multiple checks to save yourself from losing to this mon is just too unhealthy for the metagame.The beauty of physical attacking pokemon is that they are susceptible to both burn and intimidate. Of course a megagross won't stay in on an obvious WoW, but what it does is it forces them out hindering his ability to sweep. He also has no attack boosting set up moves, the only way to up his attack and sweep is through a less accurate alternative that is at best unreliable for setting up let alone hitting (aka meteor mash). Part of the reason i don't think he should be banned is all of these factors contributing to megagross being unable to sweep reliably which basically defines ubers (a pokemon that can set up on a majority of the tier and sweep)
Let's talk typing. Steel Psychic is a pretty solid typing defensively being resistant to 9 other types and weak to only 4. Again, another upside to being a physical attacker who is also a psychic type foul play is a very nice alternative to countering. Typically used on dark types (who are immune to his psychic stab allowing for an easier switch prediction) with massive amounts of bulk allowing sustainability in a 1v1 fight against a megagross (ex: Sableye(mega or not) and umbreon)
Of course with his massive 150 def stat, he is an insanely fat mon and hard to take down (admittedly quite annoying) but he is weak to common typings.
Ground (try to find a team without a lando)
Dark (bisharp pursuit pressures and sucker punch pressures along with the previously discussed weakness to foul play)
Fire (fire coverage is necessary with or without megagross due to how common the steel typing is due to its fantastic defensive capabilities)
Ghost (i really like scarf gengar which can be used against any set besides the agility set but the substitute gengar set can do well end game if they are forced into megagross while u have a sub up or putting one up the turn they come in)
TLDR: While megagross is strong and intimidating to a team not specifically prepared for him, his weakness to common typings and susceptibility to WoW and intimidate which are both very common allow any person to work around a megagross reasonably. This coupled with his inability to reliably sweep due to his lack of set up moves (really only agility but does nothing when discussing his ability to ohko with no boosted attack) make him easy enough to work around in any battle.