>>21048904Compare the meta before the ban with what it looks like now.
No one runs Dark Pulse on Greninja anymore because it only ran that for Aegislash.
No one bothers with Ghost coverage on anything because they only needed it to deal with Aegislash.
M-Medicham, M-Gardevoir, and M-Heracross have taken OU by storm because they no longer have to dedicate a moveslot to taking down Aegislash.
M-Mawile tore through the standard tier and wound up being banned because it no longer had to play painful mindgames with Aegislash.
Psychic-types are far more plentiful now that there are fewer Dark and Ghost moves being thrown around to kill Aegislash.
Starmie, Alakazam, and Aerodactyl are thriving in OU now that they don't need to prepare for the power of Aegislash.
And stall teams are running Eviolite Doublade to make up for losing the sheer defensive utility of Aegislash.
It literally defined the metagame. It's like night and day.