Reuniclus

Reuniclus is a versatile Pokemon that can either serve as a potentially devastating late-game wincon with its offensive sets or as a defensive tank that can utilize its naturally good bulk and a multitude of utility options to support its teammates. Both of its abilities are fantastic; Magic Guard's immunity to passive damage is incredibly valuable for making Reuniclus very hard to take down as a setup sweeper, which makes it match up amazingly well against bulkier structures and Pokemon that struggle to deal large amounts of damage, while Regenerator allows it to enter the field and take hits for its teammates more often, helping Reuniclus fill more of a support role. Reuniclus's good natural bulk and access to Recover further solidify its longevity to impressive levels. However, Reuniclus's very low Speed stat makes it unable to outspeed anything relevant, including other base 30 Speed Pokemon, without resorting to Speed creep. This forces Reuniclus to tank hits very frequently, which hinders its longevity. Reuniclus's mono-Psychic typing further renders it weak to two of the most common attacks in the game in Knock Off and U-turn as well as Dark- and Ghost-type attacks from wallbreakers like Bisharp and Basculegion-F. Lastly, Reuniclus competes with other common defensive Pokemon, in particular Slowbro, Mew, and Jirachi, as they are all able to perform similar and potentially better roles as both Calm Mind sweepers and defensive sponges, which means that Reuniclus may not always be the best fit for a particular role.