This is a flawed argument - the suspect test is not to ask "what is overpowered?" but instead "Is [this item/move/ability/pokemon] overpowered?", and something being overpowered in your eyes does not make another pokemon not overpowered.I admit it's a good pokemon, but there are more OP pokemons that abuses certain abilites such as No guard Hypnosis Gengar, or Z hypnosis Xurkitree with ZAP CANON, or TRIAGE abusers that forces you to play magic guard and some bulky and stall pokemon with unaware. So that mean LIMITED TEAMBUILDING and an overcentralized meta. and only then, we can discuss about baning a good but not OP pokemon.
So, as far as i'm concerned, i vote for ZYGARDE: No Ban. Hope you take my request of suspectin those shitty broken abovementioned problems