One Pokemon that I've had some fun with is TrickScarf Gallade. Even without Swords Dance and a boosting item, it still packs a fair amount of power with 349 (or 383 if you run Adamant, but I prefer Jolly simply because it outspeeds Jolly Rock Polish Rhyperior) Attack, and it makes a great Raikou check, though be careful about sending it into a full health Raikou while it Calm Minds, because it will survive the Close Combat and OHKO with Thunderbolt even without Life Orb. It also gets surprise kills on things like Mismagius, Swellow, and Ambipom that expect to outspeed. However, what's so great about it is that completely screws over its usual checks, especially those damn Spiritomb I've been seeing a lot of. 4 out of 5 times I Trick right away, no matter what Pokemon is out, and it works almost every time.