DDD MU please tear it apart if its wrong or i can add info or w.e have you.
60:40 Mario
DDD has a pretty difficult time with mario, but you wouldnt notice it if you don't know the MU. DDD weight/fallspeed allows him to get pieced up nicely by mario. The Punish game isnt the hardest part of this MU. Its the getting in and staying in.
Neutral: Mario wins the neutral. He faster, he's smaller he has alot mroe to work with. Where is DDD has be really strategic about how he goes about the MU. The first rule of thumb should be to stay in the middle of the stage at all times. If you lose stage control you might just lose your stock. DDD is does really well with stage control. Thats like 90% of his game IMO. STAY AWAY FROM THE EDGE. DDD thing is gimping, moves like DDD fair covers alot of space as well as his ftilt and other spacing tools; so yea don't do it bruh. also his back air is pretty dangerous. DDD also gets good tech chases off of grab so be wary of that as well. DO NOT LET THE WADDLE DEES WALK AROUND. thats essentially how DDD moves around, its burst movement that could convert into a grab. Just kill them when you can. Don't let them surround you neither. F tilt or Dsmash are strong and quick enough to get the job done. ALSO pill clanks with F-tilt so yea.... and any other normals for that matter.(that doesnt mean aerials)
Punish Game: Punish hard, chain grab(with down throw), d-throw combos w.e have you. TBH their isnt much to this for DDD. Up tilts are super deadly on him and if You grab him you should be taking 40-50%. DOwn throw fair kills stupid early, 80 i believe(could be wrong but still early AF)
Edgeguarding: More often than not you might just outright kill DDD before you edgeguard him. DDD an waddle dash in the air. He typically uses that to get closer to the stage. Becareful of trying to edgeguard during that moment. A Good DDD main might only show you short air waddle dashes, then use a super long and quick one when you get closer. Be aware. As for DDD's up b, Mario's cape will be your best friend for this MU. DDD has to go into special fall if he wants to grab ledge with his Up B. REMEMBER THAT. If DDD is below the stage trying to recover, that severally limits his options. FOr the most part he's going to have to opt to go on stage. From there you can follow up F-air or w.e. Remember upon landing two star shaped hitboxes, come out the sides off DDD.
How to recovery: lmao give up. DDD is extremely strong at gimping. Every time you recover sucessfully consider it a blessing. Our recovery is rather linear and easy for DDD players to read and edgeguard. DDD's F-Air covers a ridiculous amount of spaces. Also his B-air feels like it was made to gimp ._. Use fireballs as much as you can when recovering from high, to disrupt DDD. From below if DDD trys to come out and gimp to early, You could beat him out with the begining of your Up B since its invincible. Also save your jumps it could be critical to you recovering. alsoo ALWAYS SWEET SPOT.
What can we crouch cancel: idrk tbh. CC wont be happening as much in this MU. Also even if you did CC(lets say his Nair) you might get grabbed because of it.
What stages to pick: Not battlefield(this is DDD's play gorund), General rule of thumb the less pllatforms the better. Also the smaller the better. NOT DREAMLAND. PS2, Ghz(?),Smashville. Yoshi story is good because its small, but the platform style does aid him more than you.
Info From a DDD main( Kinje thanks man):
Yeah, it's pretty well established that this match up is good for Mario. Dedede doesn't really have any non-read-based combos against a Mario with solid DI, while Mario's dash attack, nair, jab, down throw and up throw pretty much set up into a guaranteed follow up on Dedede until about 90%, and oftentimes higher if the D3 player in question doesn't have really good DI. Mario has a far better projectile, and as such doesn't have to approach Dedede unsafely, thus making Dedede's stronger zoning tools (big disjoints, crazy shield grab, aimable projectile) not all that useful in the matchup. His dash speed and wavedash are better, and he's overall a faster and less laggy character, with the exception of fall speed. His side b and and down bs' stall properties also give him good mix ups on DDD's shield which, combined with the king's already lackluster OOS options, make it really rough to get out of shield pressure and back into neutral once Mario spaces a fireball that dedede can't power-shield on reaction.
Additionally, cape+dedede's unsweetspottable recovery=easy gimps.
The one area dedede beats Mario is, as per the usual, offstage. However, Mario has a pretty unique and amazing recovery, that can be mixed up a lot if you have good DI and save your double jump. If you recover high, you can also usually throw out a fireball then airdodge back to the stage safely.
Honestly, the only reason it even seems close to even as a MU is that very few Mario players have any experience with the matchup.