Sigilyph

Sigilyph is one of those Pokemon that has always been able to stand out in RU. With an amazing ability in Magic Guard giving it an immunity to any residual damage, Sigilyph can become a well-rounded threat in any match. Its good Special Attack and Speed give it scary offensive potential. BW2 made it even better, as Heat Wave was added to its arsenal, making an offensive set more viable and not as easily walled. Sigilyph can also perform a defensively inclined role with Cosmic Power, Roost, and Stored Power to effectively deal damage. It's not absolutely flawless, however. Sigilyph is not very bulky before setting up, with only 72/80/80 defenses and a multitude of common weaknesses. Don't let that deter you from using Sigilyph, though, because it can be a very effective Pokemon when given the right circumstances.