Emboar

Emboar's above-average Attack stat combined with its ability Reckless makes it a threat to be reckoned with in 1v1. Its STAB moves alongside Head Smash allow it to OHKO common threats like Magearna, Heatran, and Mega Charizard X and Y. Choice Scarf allows Emboar to outspeed and KO some common fast threats such as Jumpluff, Naganadel, Modest Greninja, and Mega Lucario. However, defensively, Emboar's lackluster bulk alongside its Fire / Fighting typing makes it lose to common threats that can bulk for its moves, like Dragonite, Mega Gyarados, and Landorus-T. Furthermore, Emboar's lackluster Speed forces it to use a Choice Scarf to win most of its matchups. Additionally, even with the Choice Scarf boost, Emboar still can't outspeed common fast threats like Mega Lopunny, Timid Greninja, Choice Scarf Porygon-Z, Zeraora, and offensive Deoxys-S. Also, because Emboar usually needs to use Choice Scarf, it fails to gain the offensive presence necessary to beat matchups that its coverage enables it to hit super effectively, like Mega Metagross and Mega Blaziken. Lastly, it faces rolls against Pokemon like bulky Victini and bulky Mega Charizard X when running a Jolly nature and is unable to outspeed Pokemon like Naganadel and Jumpluff when running Adamant.