mountain_tiger
Smash Champion
I imagine quite a few people will probably say Sing, but honestly I think that Jigglypuff's DTilt is worse. I mean, with Sing, if you can get an edge-cancelled Sing on your opponent, it's a free Rest. It's unlikely, but it can happen. With DTilt, it has exactly the wrong amount of knockback: too much to combo into anything, but it doesn't kill until like 500%. It isn't even that fast, and it's easy to punish.