diddy

Tips for fighting diddy kong
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Wavedash - It picks up bananas /even in the air after they are thrown at you/!
it also catches peanuts. Airdodging catches items, and wavedashing is just airdodging into the ground, so it has the same property of catching items.

Control bananas, but don't throw them back at diddy without a solid opening! I'm wavedashing all the time, I'm pretty happy to have my banana back. Two common strategies are to just throw them off stage, so that I have to respawn them (respawning them is laggy) or to keep them behind you, so that I can't get to them.

Try not to shield bananas. Diddy is often behind the banana ready to punish the shield stun with grab.
You can tech bananas. Don't get confused by the time it takes to tech, you get invincibility and it's just like any other tech chase. Make sure you mix it up.

Diddy is a bad weight: he's light and a fast faller. He gets combo'd like the space animals, and some characters like Marth and Mario can chaingrab him.

Diddy sweet spotting up b is possible, but difficult. Most of the time the Diddy will fail. You do not need to go offstage to edgeguard. Watch if the Diddy Kong is recovering high or low, you can tell by the angle before they release.
Diddy's forward smash and dtilt reach very far in front of him. You can't stand in front of diddy and really be at a safe distance, sorry.

Diddy's most reliable ko move is his forward aerial, with insane frame data and hitbox. So where don't you want to be when fighting diddy in the air? In front of him.

"Why should I learn how to crouch cancel on reaction?" - http://gfycat.com/ImperfectEquatorialAgouti
"Why should I learn how to shield on reaction?" -
http://gfycat.com/ImperfectEquatorialAgouti
"Why should I learn how to SDI on reaction?" -
http://gfycat.com/ImperfectEquatorialAgouti

SDI is your bailout against Diddy Kongs dash attack. I wouldn't rely on it, but if you're already in the move, oh well. Shield protects you, but you can't immediately attack out of it. It's up to you and your % whether crouch cancelling or shielding is a better way to stop dash attack.

Diddy has a side-b command grab which can be cancelled at any point in the move into a super high priority kick (goes through projectiles). You can probably roll out of the way on reaction to it coming, but if you have the read right you might be able to punish. Diddy can only side b in the air one time, then he has to land before he gets it back!*
*note that this is a difference from Brawl and Smash 4, where Diddy can side b every time he gets hit, but loses his up b if he kicks until he's hit again.

Pick stages where bananas are not going to control your mobility too much. Platform stages are good, but long horizontal stages can be dangerous. There are character specific exceptions. I think Dreamland is an exceptional diddy stage, so go there with caution (flowers hide bananas).

That's about everything I know. Diddy is still an ultra good character, but I hope I can help you guys fight him a little better every week.