Beheeyem

Beheeyem is a powerful wallbreaker thanks to its huge base Special Attack stat that is further augmented by Analytic boosting the power of Beheeyem's attacks when it moves last. Due to its access to both Trick Room and Nasty Plot, Beheeyem can effectively function versus offensive and defensive teams alike. This is furthered by Beheeyem's incredibly low Speed stat of 40, which allows it to outspeed virtually the entire tier under Trick Room and take full advantage of Analytic when outside of Trick Room. However, only passable bulk in addition to its terrible Speed stat mean that Beheeyem finds few opportunities to set up and is easily forced out by many offensive threats. This is further exacerbated by a poor defensive typing in Psychic, which bestows few useful resistances outside of Fighting. Psychic also isn't a great offensive typing to have in a tier rife with powerful Dark-types such as Skuntank and Absol and their STAB Sucker Punch. Compounding these issues, Beheeyem struggles to make room for Recover, leaving it easily worn down throughout the match and vulnerable to priority. Beheeyem also faces heavy competition from Alolan Raichu and Musharna outside of Trick Room, with Alolan Raichu having a much better Speed tier to make better use of Nasty Plot, a powerful secondary STAB move, and a more diverse movepool, while Musharna has much better bulk and makes for a more potent slow setup sweeper. Lastly, Beheeyem faces competition as a dedicated Trick Room special sweeper from Pokemon with better offensive and defensive typings such as Wishiwashi and Drampa, who hit harder and have better bulk, though neither have access to Trick Room themselves.