Lucario has always been revered as a master in offensive versatility, due to his massive coverage, excellent Attack and Special Attack Stats, and superb boosting options in both Swords Dance and Nasty Plot. Adding on to his great power, the Aura Pokémon possesses new found feats in moves such as Rampage, Giga Spark, Magnum Punch, Diamondblast, Magnet Force, Psygatling, Raze Earth, and even Wood Hammer. With all of this coverage, Lucario is able to hit every single Pokémon in the Tohoak Region for supereffective damage. (Except for Sableye & Gehemoth, of course.)
With this being said, Lucario is easily one of the best Pokémon to utilize in Vega and he should always be considered when you are in need of an offensive powerhouse for your team. Let us hope that he and Riolu will be in the full releases of Pokémon Procyon and Pokémon Deneb!