Out of the Pokemon allowed in the Battle Frontier, Lucario, Togekiss and Raikou (event only) get it. Dialga, Palkia and Giratina get it too, but they're banned there.
A few nights ago, I 3-0ed Thorton with Scyther in the lv. 50 bracket. I Swords Danced up to +6 Attack, with his Quagsire using Counter each time, and then OHKOed that and his Gliscor with Aerial Ace and Gardevoir with X-Scissor. Here's the set if you're interested:
-Swords Dance
-X-Scissor
-Aerial Ace
-Night Slash
Nature: Jolly
EVs: 252 Atk/252 Spe
Item: BrightPowder
Ability: Technician
Neat, huh? I would've preferred Brick Break over Night Slash, though.