I will preface this by saying that i am 100% a pure blood falcon fan, but when it comes to the best/most talented character in the game, hands down anyone who is good with him will win no matter what:
Pike-fire, annoying yet works. The yoyo, Up + A, down + A, unstoppable. The bat, one of the best over + A moves in the game besides Donkey Kong's bitch slap. The thunder ability, only controllable attack that can move across the screen, ness can get hit with that and not be hurt at all, AND the best way of recovering from falling of the map, AND if you're good you can hit other players with that move and it's better than a falcon punch, powered up Samus, or wound up DK. Add on the fact he can regenerate health from other puny attacks, his jump is better than others, and his grab seems to be the most successful in throwing in both directions, you've got yourself one badass motherfucker.