Pit has this...
Better weaponry, better defensive measures.
Bat is like the whole Improvised weapon spiel, it's not as easy to get the job done with as a sword is, while pit can shield and attack, eliminating Ness's options of attack.
Pit could even use his shield as an attack and shield ram Ness, this keeps Pit protected and once Ness hits the ground, the swords come and its GG.
without PSI Ness is like that neighborhood baseball geek who gets attacked by Pit, the ex- naval officer
all of Ness's offensive strategy would have to come from Ness getting a cold clock strike on a weak point on pit (his head, his manhood) and Pit can keep that covered with his shield, and make his moves on Ness's openings.