Beautifly

One of the weakest Bug-types around, Beautifly is simply a terrible Pokemon to use competitively. Her many terrible qualities, including a horrible typing that causes her to be 4x weak to Stealth Rock, poor stats, and a shallow movepool all make her to be a rare sight to behold in battle. Beautifly's only decent stat is her Special Attack, which even then, isn't that great because it's hindered by her poor Speed stat. In addition to this, her only real boon over other Pokemon such as Mothim is her access to Stun Spore, which, due to her frailty, isn't really that much of an advantage. Overall, don't expect Beautifly to be a Pokemon that you can simply throw onto a team and hope that she works; you truly need to base most of your team around her, and even then it's probably not worth it since there is almost always a better Pokemon that can take her place.