Advent Lee
Smash Ace
LoLzunless you're Advent, in which case you have three bananas.
MK cannot effectively Dair camp/zone a Diddy that knows what to do about it
* You can Up-B into a MK who is staying above you with Dair's. They will either take %10 from the jet pack attack or potentially take %18 if they hit you because your barrels will fly off. The Up-B is fast enough to catch a MK off guard, and most players would not expect that in the first place.
* You can also Up-Tilt a Dair camping MK (especially because Diddy's Up-Tilt has good priority) This can potentially lead into Up-Air combo's/string's. However sometimes might be hard to hit with seeing as how they would have to be quite low to get hit by it.
* Plucking bananas with Down-B is another great option. The bananas has insane priority and have a great trajectory (especially when smashed) that can disrupt many above approaches including Dair camping MK's.
* Crawl away/Run away. I rarely see Diddy's implement the crawl and sometimes just downright forget about it. The crawl makes Diddy's horizontal hurt box much smaller and allows him to move with it. If you feel that it is too slow then just run away Seriously though because unless MK is gliding his aerial momentum is not so great, so you can literally outrun MK if he is in the air.
-advent-