Both of them have simmalar types...
Defence or Offence...
Is different though.
A difficult decision! But I gotta give it to Scrafty, I`ve wanted a Dark/Fighting type since ever, and Scrafty is exactly that. Lucario is great too though.
Lucario for being faster and, with the addition of Nasty Plot, will take down that gangster wannabe back to the ghettos with STAB Aura Sphere.
Tough choice, as I'm not particularly fond of either of them. I dislike Lucario and Scrafty's design intrigues me. However, I have trained a Lucario but not a Scrafty (yet,) so Im'ma go with the one I know how to use, Lucario.
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I'll say Lucario. Sure, both can kill each other quickly, being Fighting-weak, but Lukey resists Scrafty's other STAB.
I will admit, though, that those wannabe-L.A. gangstas are very difficult to take out after a Bulk Up/Dragon Dance/max Defense investment.
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I'll pick Scrafty. Whilst I'd admit Lucario can learn a lot of moves and is a great battler, I feel like they're trying as hard as possible to get people to like it, and that always annoys me. Scrafty, meanwhile, has an awesome and unique type, giving it a complete resistance to Psychic attacks. Above average attack and strong defences combined with Moxie make it a great offensive and defensive monster.
Scrafty, totally totally Scrafty for me. He's got the best design in Pokemon history, a much wider movepool, and one of the best typings around. He'll just Drain Punch that Lucario after hanging on with its Sash, or just freakin' live the hit because he's so damn bulky.
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Lucario all the way because of his design XDD He's epic cool!
I'm going with Scrafty, but I am pretty biased. I never really liked Lucario, and rarely used it, but I love the movesets that Scrafty can have, and it gets some great set-up moves - Bulk Up and Dragon Dance. Shed Skin and Rest, too, help it along greatly.
I don't care much for either, but if I was pressed to choose I would go with Lucario for the sake of design.
Lucario is my vote because it has more adaptable EV's, so it can be used as a Special, Physical, or a Mixed attacker in battle. I have yet to train one on Pokemon Black, but am seriously considering to use this cute Egyptian style fighting dog.
Scrafty has decent defences and two great abilities (Shed Skin & Moxie), but just can't hit hard like Lucario can. Also the only use I really see for Scrafty is a defensive attacker (not really a tank) with Shed Skin as it's ability.
I have tried a Moxie Scrafty, but because of it's mediocre attacking stat it doesn't last long in battle to pull off this ability in my opinion. I used a dragon dance set for Scrafty with it's ability Moxie, but other Pokemon like Gyarados and Salamence for example pull this off much better than Scrafty can.
For me, Scrafty. Dragon Dance + Moxie. Lucario looks cool, but I've never even used him.
Starters of choice.
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