Swoobat

Swoobat is a mediocre Pokemon, but has one decent niche. The combination of Simple and Calm Mind grants Swoobat a +2 boost in both Special Attack and Special Defense after only one turn of setup. In addition to this, it also gets access to Stored Power, a 100 Base Power STAB attack after only one Calm Mind. While this might make Swoobat seem like a top-tier threat, it has quite a few flaws holding it back. Aside from its great Speed stat, all its other stats are terrible. A mediocre base 77 Special Attack means it needs at least one boost to do any sort of significant damage. Its 67 / 55 / 55 bulk doesn't do it any favors, and it is weak to Sucker Punch, the most common form of priority in NU.