This is what bothers me: does no one agree that you can easily use the +2 atk to sweep if you do it right? I can't tell you how often I've swaggered a garchomp who subsequently snapped out of confusion and swept my entire teaman with +2 EQ. Like seriously. It isn't even worth discussing banning. If you ban this, you might as well ban togekiss for paraflinch. This topic is so stupid.Some points I've seen supporting Swagger:
1. You can switch out...and get half your team paralyzed, and possibly eaten up by entry hazards. Now your weakened, paralyzed team is bait for Mega Garchomp, Mega Heracross, or any manner of insanely strong albeit slow bulky attacker.
2. It's not an effective strategy...and neither is Double Team. Still, it turns a game of RNG chess in to a series of coin flips. Your point's pretty meh
3. It can be Taunted...but not if the taunter is the one switching in, and hits itself to death. Oh, and also, the same Pranksters with priority Taunt are used by Parafusion teams.
4. Electric/Ground types can't be paralyzed...and can still kill themselves over a series of coinflips.
5. Hax exist...but not to the extreme of a 50/50 every turn. The chance of full paralysis is a simple 25%, a Focus Blast miss is 30%, and Play Rough is a 10% chance of missing (and there's still people who want the acc checks removed on these moves, even with the lesser chances of them happening). Also, with all these, there's ways around them, like not using lower-accuracy moves and running Electric/Ground types to avoid paralysis.
6. Magic Bounce beats Swagger and Thunder Wave...and all of the Magic Bounce users besides Mega Absol (who takes a Mega slot and can't switch in until after it mega evolves) are weak to Foul Play. Furthermore, none of them are too great: Espeon is the only one of the four that is OU, and it's considered one of the worst OU mons anyways.
7. Infiltrator/Sound moves/multi-hit moves...can still be haxed to death.
Finally, who wants to run Thundurus or Espeon on every team? Good lord, that makes teambuilding boring.
Do not ban anything.