Chimchar

Chimchar has a great movepool, with access to stat boosting moves such as Swords Dance, Nasty Plot, and Flame Charge, but it is held back by its mediocre stats. Chimchar does, however, make a great lead, because it can either set up Stealth Rock, or deal massive damage to the opponent's lead with a combination of Fake Out and Overheat. However, after using Overheat, Chimchar will be left at a disadvantage, because it can either be easily revenge killed or set up on, since its Special Attack is cut in half. Team Preview has not been kind to Chimchar either, as the opponent will see Chimchar as a lead and rearrange his Pokemon accordingly to give it an outright disadvantage. Chimchar still makes a great lead though, and is not to be underestimated.