Sagen du Smash
Smash Journeyman
I think its a tie between Meta Knights Dsmash and GAW's Up and Foward Smash. No lag on any of these moves and they can be spammed with almost a guaranteed hit. Especially the DSmash. Tornado isn't that bad and Shuttle Loop can be blocked. Dsmash, forget it. I wouldn't mind playing against Meta if not for Dsmash.