Jirachi

Jirachi is one of the most dynamic Pokemon in SV RU with a plethora of sets at its disposal. Its diverse movepool gives it access to fantastic utility options such as Stealth Rock, U-turn, and Encore; potent offensive tools such as Iron Head and Calm Mind; and incredible special coverage including moves like Thunder and Aura Sphere, meaning that Jirachi is able to fit almost any role that its team requires; this has the added benefit of making its set difficult to discern on Team Preview. However, in true "Jack-of-all-Trades, Master of None" fashion, Jirachi can sometimes find itself outclassed in the plethora of roles it can fill. Its lack of immediate recovery and unspecialized defenses render it inferior to physical walls like Hippowdon and Chesnaught and specially defensive ones like Empoleon. Jirachi's weakness to Dark, in particular Knock Off, holds it back quite a bit from being a reliable entry hazard setter and defensive sponge. On many teams, Jirachi competes for the Psychic-type position with other potent Pokemon like Slowbro and Reuniclus that may fill roles such as spreading status and sweeping with Calm Mind more effectively; hence, opting for Jirachi incurs a noticeable opportunity cost. As a setup sweeper, Jirachi's inability to boost its Speed can leave it fearful of revenge killers like Gengar, Mienshao, and Terrakion. Lastly, Jirachi's relatively weak offensive power means that it can often struggle to make progress, even with a Choice item.