Bibarel

Bibarel is generally an unfortunate case. All three of its abilities are among the best in the game (Moody being banned for being too overpowered), but Bibarel simply lacks the stats and movepool to make good use of them. Bibarel does possess a decent support movepool with options such as Stealth Rock and Thunder Wave, but it is so heavily outclassed that dealing with its countless flaws is not worth the trouble. However, Bibarel does have the potential to be a plausible threat by using Curse alongside Simple and its great STAB coverage. Even so, Bibarel is still a very weak and underwhelming Pokemon that has no chance of being the serious threat it could have been if it wasn't so cruelly designed.