Swagger is a confusion move...confusion os not worth a ban...it's there for 5 generations, and never done any harm. Like t-wave. The problem is everything together...What strategies does that limit that aren't entirely hax based?
It seems the anti-ban crowd is more focused on freedom of choice than the actual metagame. We shouldn't limit player's options guys lets allow Evasion moves everyone will just have to run Shock Wave and Aerial Ace to compensate. We shouldn't limit player choice even if it's haxy for some reason.
The only compelling reason to keep Swagger has been for phasing.
Ban the set together (prankster, foulplay, t-wave, substitute, swagger) and this strategy won't work anymore...the best chance of using this strategy will be replacing substitute for something else, and that means 50% chance of klefki probably dying.