Up-B has a deadly sweetspot.

[Xheracross]

I haven't tested anything in actual matches so I don't know how much DI can affect the follow up, but when messing around in friendlies I can kill with D-throw to Up-B from as low as 83% on Mario on standard Final Destination. Apologies if this is already known, I'm new to the boards, but I haven't seen anyone talk about this insane kill potential from a grab.

 

[ndayday]

It is known, there are quite a few threads where it's talked about. It can also combo from dash attack at lower percents. up air strings into shuttle loop is a thing too, etc. read up!

 

[KeeblerGuy]

Your opponent can DI to the right/left to avoid it, but you can FThrow if they are DIing like that. It is most useful for ending combo strings.

 

[Xheracross]

I'd imagine they can DI slightly left or right but I would think you could still follow up since you can Up-B while dashing, making it just a matter of timing.

 

[DiggersBoy]

I recommend the Lovely Data Thread that I made (shameless plug), if you wanna learn the basics of Meta Knight! I got things like Ito's throw guide, the many slashes of DownB, and much more!

Actually, did I even mention in that thread throw combos lmao