The Cipher Peons are not there, but I'm totally voting for them too.
![](http://pre08.deviantart.net/39fc/th/pre/f/2014/364/b/0/pokemon_xd_cipher_peons_by_arcdoggy-d8by3bf.jpg)
They have freakin' armors as uniforms, a badass musical theme, and turn Pokemon both evil and super effective to anything that's not a Shadow 'mon like they are.
As for the handheld ones presented here, I'd go with Team Rocket first, and Team Aqua as a VERY close second.