0RLY
A great conversation filler at bars and parties
Diddy has the godliest neutral game in PM. In order to take that away from him, you must play on the absolute smallest stage with platforms. YS, WW, and FoD are your best bets. However, these 3 stages are often banned. That leaves you with GHZ and Yoshi's Island. It sucks because YI has the platform that makes reaching bananas harder, but GHZ has the stage size you want. Eat diddy's bananas when given the chance. I also think you can eat his popgun shots. (Makes me wish Wario healed or something for having to go through the laggy animation, but whatever). The object is to stay outside of Diddy's shffl fair range but within his max dash attack length or max SB length. At this range, Diddy won't feel safe getting out bananas. If he does try to fh naner toss, you should be able to catch him with your SB+jump assuming you were able to keep that spacing from before. You can also punish grounded naner toss with a dacus. His glide tosses are extremely safe, so the best thing you can do is mix up how you react to it. Shield, roll, jump, bite, or fair it to remove the hitbox on it. I particularly like the last choice.
If diddy ever dash attacks you off the stage, DI down and attempt to fastfall. You absolutely want to avoid getting hit by the hitbox that launches you into Diddy's fair/dair/up-b. When you recover, instead of going straight up, try to go at an angle. His dropzone bair or SB can ruin your day if you don't. Remember to tech, Diddy has one of the fastest dairs in the game, and he may even follow up with up-b spike if he misses.
Dacus to uairs works against him. Setups include fthrow, bite, or nair. When edgeguarding, use the waft in place of when you would aim for sweetspot nair (it's not so great as a recovery in this MU. Diddy will often try to recover at an angle, mixing aiming for the ledge and at you on stage. If you take the ledge, you can cover both options fairly reliably with lh nair/bair/waft. Diddy may try to start up-b from higher up to get around this, and you can then beat him with SB. Of course, the straight-up recoveries should be daired. This is why GHZ and YI works well is because the sides of the stage are flat. Diddy won't be able to ride the wall, like on FD.
vs. Ike
Refresh your ledge invincibility with lh SB cancels and roll as he throws his sword up (up-b). If he starts his up-b too high to beat it with a roll (as in he can land on the stage), allow the sword to go over your head then immediately drop sweet nair. If it's side-b, watch to see if he's aiming at you or the wall when he releases. If it's at you, fastfall. He will swing to stall in the air a bit in order to grab the ledge. Double jump nair/waft into him during the swing. If he's aiming at the wall, drop off sour nair as he wall jumps. This kills the Ike. If he aims high, like towards a platform, ledge jump (you'll likely be behind him) and aim for a bite. Ike players will always shield after landing from air-QD. Then throw him back off stage and kill him for real.
If you can't get onto the ledge, you pretty much have to let him back on stage.
If diddy ever dash attacks you off the stage, DI down and attempt to fastfall. You absolutely want to avoid getting hit by the hitbox that launches you into Diddy's fair/dair/up-b. When you recover, instead of going straight up, try to go at an angle. His dropzone bair or SB can ruin your day if you don't. Remember to tech, Diddy has one of the fastest dairs in the game, and he may even follow up with up-b spike if he misses.
Dacus to uairs works against him. Setups include fthrow, bite, or nair. When edgeguarding, use the waft in place of when you would aim for sweetspot nair (it's not so great as a recovery in this MU. Diddy will often try to recover at an angle, mixing aiming for the ledge and at you on stage. If you take the ledge, you can cover both options fairly reliably with lh nair/bair/waft. Diddy may try to start up-b from higher up to get around this, and you can then beat him with SB. Of course, the straight-up recoveries should be daired. This is why GHZ and YI works well is because the sides of the stage are flat. Diddy won't be able to ride the wall, like on FD.
vs. Ike
Refresh your ledge invincibility with lh SB cancels and roll as he throws his sword up (up-b). If he starts his up-b too high to beat it with a roll (as in he can land on the stage), allow the sword to go over your head then immediately drop sweet nair. If it's side-b, watch to see if he's aiming at you or the wall when he releases. If it's at you, fastfall. He will swing to stall in the air a bit in order to grab the ledge. Double jump nair/waft into him during the swing. If he's aiming at the wall, drop off sour nair as he wall jumps. This kills the Ike. If he aims high, like towards a platform, ledge jump (you'll likely be behind him) and aim for a bite. Ike players will always shield after landing from air-QD. Then throw him back off stage and kill him for real.
If you can't get onto the ledge, you pretty much have to let him back on stage.