Roggenrola (lazy design, bad name pun + Sturdy)
You know what annoys me more than Tentacool? Zubat. Every time you're in a cave, you're guaranteed to encounter them in each of your step. ;o; Plus, its cry is a screeching sound, which doesn't help make it very pleasant. In gen five, though, it was replaced by Woobat, so that was a nice change of pace.