Sorry if I'm a little late!
I think Bowser Bomb to the ledge is an incredible option. It's amazing at dealing with characters who can't sweetspot the ledge, such as
,
, and
. It also punishes holding on to the ledge for too long, or a poorly timed jump from the ledge. If you get the trump, go for a back-air (or a down-air for style points.)
Also, something people don't know about
is that his neutral ledge get-up has a lot of invincibility frames. Along with
, it has 54, the most of any character spare the Miis and
. This means that you can Bowser Bomb the ledge, and just calmly get up from the ledge if it fails.
I personally think that Bowser Bomb to the ledge is an underrated option. It's great for keeping your opponent on their toes, and just scaring the crap outta them. Obviously, as with anything in Smash, don't get too comfortable and don't spam it. It IS punishable, if your opponent sees it coming.
EDIT: Almost forgot to mention, great an option as it may be, don't try it against
. Trust me, I learned the hard way.