Lucario

Lucario has both excellent physical and special attacking stats, giving it the role of an unpredictable offensive presence. Access to Extreme Speed gives it powerful priority, making it a perfect candidate to take advantage of Refrigerate, further increasing the number of roles it can fill. Having both Swords Dance and Nasty Plot allows Lucario to become incredibly strong with both physical and special sets. With access to solid coverage moves like Dark Pulse and Crunch, Lucario is difficult to check, and its 4x resistance to Stealth Rock allows it to switch in often. However, Lucario has a mediocre Speed stat that causes it to lose to many offensive threats. It also has poor bulk, leaving it especially vulnerable to being revenge killed. Its secondary typing gives it several key weaknesses in the AAA metagame, without providing good STAB moves. Overall, Lucario is a strong attacker that has great boosting and priority moves that provide it with the versatility to fill several roles excellently.