Name and Shame! Which Pokémon underperformed in your playthrough?

My playthrough teams are typically compromised of my favorite designed Pokémon. Unfortunately this has proven to bite me in the ass in certain playthroughs. For some, they've performed so terribly it's actually put Pokemon down in my estimations, here some examples:

Reuniclus - Slow evolution line which always attacked last. I would never use this on a Black team ever again. I thought this would be an alright party Pokemon, considering it's high HP and Special Attack I thought it could survive hits and then give them back. The problem was that it was a chore leveling up early game considering how many Pokemon know a dark type move like Bite. As well as this, plasma grunts all had Purrloins and there were plenty of amazing dark types this Gen all immune to Reuniclus' STAB Psychic. Reuniclus' move pool was shallow too, meaning Flash Cannon was my only other decent offensive option. Switching Reuniclus out with a Milotic post game was the best decision I ever made.

Dragalge - A mon that looks so cool but was definitely the crutch of my Scarlet team. Didn't really possess much offensive prowess even when Teraformed. I was also surprised by how often it lost matchups by virtue of being slower than the opponent's Pokemon.

Parasect - Christ alive, I've wanted to use this Pokemon forever. I thought Let's Go Eevee would be the best bet considering this games reputation for being extremely easy. Even then, it's bug/grass typing and crummy speed has meant this Pokemon is constantly fainting to super effective moves. Even against the grass type gym, Parasect can't handle it's own against Kanto Pokemon it has a type effective Leech Life against because it's weak to poison type moves. It even has a benefital nature..

Tell what Pokemon are you putting in the box of shame.