Pikachu

Pikachu stands out among the relatively small crowd of Electric-types as a strong, fast wallbreaker and late-game cleaner. This is largely due to Pikachu's exclusive item, Light Ball, which doubles its Special Attack, allowing it to break down defensive staples such as Dewgong and Sableye with ease. Furthermore, Pikachu has near-perfect coverage between STAB Thunderbolt and its variety of Water-, Ice-, and Grass-type coverage moves, essentially allowing it to take on any foe not faster than it, which is hard to come by because only a handful of a Pokemon exceed base 90 Speed. However, the immense amount of offensive pressure Pikachu puts on teams is counteracted by a complete and utter lack of any defensive utility. Pikachu cannot directly switch into anything due to extreme frailty, which makes it feel like playing a game with a Pokemon on your side already down: a huge disadvantage. For comparison, Pikachu's bulk is even less than that of Pokemon such as Zubat and Lotad. Pikachu also necessitates some team support, most notably in the form of Spikes from users such as Glalie and Cacturne, to help assist it in picking up KOs. The looming threat of Diglett also hampers Pikachu's offensive capabilities, as once Diglett is brought in, Pikachu is trapped, outsped, and revenge killed by Earthquake.