Bad luck I guess, although I'd rank Nosepass' rarity as uncommon. Moveset:
Nosepass@leftovers
Quiet
Magnet Pull
156 Attack/100 Defense/252 Sp.A
Thunder
Explosion
Taunt
Thunder Wave
Taunt skarms roars while it's trapped, and thunder it to death. Explode on anything else. If you're using this for in-game though, I wouldn't reccomend Nosepass at all.