Pachirisu

Sadly, Pachirisu is one of the poorer Pokemon in the game and stat-wise it's not very good at all. The combination of high Speed and Special Defense isn't very helpful; though it can help score a quick status-move (or Super Fang) on walls. The only reasons to use Pachirisu are to counter other Electric-types in the lower tiers, and utilize Super Fang to heavily weaken enemies for your other sweepers to pick off. You can't do a great deal back to the likes of Plusle and Minun, but if you can paralyze them or dig into their HP with Super Fang, they'll become almost useless. Another letdown is that both of Pachirisu's abilities are completely useless in battle.