http://www.bio.davidson.edu/courses/anphys/2000/Hatfield/Hatfield2.htm and logic.
1) And his arms, body and neck are protected because of a superior amount of muscles and fat.The only frail part about Wario is perphaps his legs and head.
Lucario is weak everywhere except maybe his legs because of a lack of muscle.
2) True, may not be allowed.
3) Wario has big muscles to help him do fast and devastating jabs.
And muscles ARE important in attack speed and really make a difference. Just use a dumbell and realize how much faster your arm moves after the session.
And about the hit and run tactic....that is not going to work because Wario will endure more time than Lucario.
And lucario standing upright is going to hinder him because dogs are durable because of the way they move when they run, and since lucario stands upright, he won't be able to resist as much as a normal dog and much less than Wario.