Pit is a high fling character with a very, very low chance of self destructing, so use that to your advantage. If you think you can jump off the stage to beat away a foe attempting to recover, do it. Pit attacks fast without letup, so he keep the pressure on. Be warned though, Pit can be sent flying easily because of his light weight and the fact that he's wearing a skirt.
PIt's Standar "B" will make him fire an arrow which can be directed from the bow, and even later during mid flight. This is considered to be a highly spammy move by many. The only thing that could make this move even more spammy is if it was fast to fire.
Up "B", simply put, he flies. Cheap, yes I know. Down "B"is a reflector shield that bounces projectiles back at their user.
Basically, that's Pit. Sorry for the abrupt nature of this post, but I have work to do.