Archeops

Archeops's great offensive typing coupled with a mammoth Attack stat, Choice Band, and access to high-Base Power STAB and coverage moves like Head Smash and Outrage paves its way for being a fast powerful attacker. Its base 110 Speed stat lets it outspeed top-tier threats including Mega Charizard X, Mega Charizard Y, non-Choice Scarf Garchomp, Durant, Mega Pinsir, and Speed tie with Jumpluff. However, its typing leaves it weak to Water, Steel, and Rock, all of which are common attacking types, leaving it vulnerable to Mega Gyarados, Mega Metagross, and Mega Tyranitar. Archeops is also very frail, so if it fails to KO the opposing Pokemon, it's most likely going to lose. This also makes it lose against faster Pokemon like Naganadel and Mega Lopunny, Choice Scarf users like Porygon-Z and Victini, as well as every Sturdy Pokemon like Golem, Donphan, Magnezone, and Sawk, all of which are very common. Archeops is also highly reliant on Head Smash for KOing foes, which is unreliable due to its relatively low 80% accuracy. Finally, its horrendous ability in Defeatist does it no favors, making matchups on Pokemon it could potentially 2HKO like offensive Mega Venusaur set-dependent, if they can live an attack and activate Defeatist, as well as harming the matchup against stall Pokemon like Porygon2 and Chansey.