I wrote this over at the Diddy Kong Boards so its gonna be in Diddy's Perspective.
I know a bit more than usual about this matchup since I main diddy and am really good with Jiggs.
Summary of character: If you thought Kirby and Mk were hard for Diddy, Jigglypuff will be your worst nightmare. In this matchup, Jigglypuff will HARDLY EVER touch the ground. She has the second fastest aerial speed, has 6 jumps, and has the slowest falling speed. She also has this move called Pound where she can attack you on the ground with a huge amount of priority w/o having to worry about getting hit by your bananas. The most banana combos your going to get in this match will be no more than 3 if your lucky when playing a good Jigglypuff. The good thing about this match is that shes the lightest character in the game and you can easily kill her which makes up for not being able to hit with your smash attacks.
Air Game: The ground is your best friend in this match because if Jigglypuff gets you off the stage theres a good chance your screwed regardless off %. Whatever you do stay ABOVE Jigglypuff when she knocks you off. Jigglypuff has a super long sex kick which completely stops your b foward and gaurentee the kill if it hits your rocket barrel .
Ground Game: If at any moment your somehow able to catch her on the ground immediately use your dash attack. Jiggs' ground game is super slow and she can't do **** especially out of your dash attack. Don't let her grab you though because she has some of the most damaging grabs in the game (each do 11% and a pummel does 3% each). Another thing to worry about is her d air, she can quickly jump and hit you with it and you better know how to DI it because if your at high % your going to get hit by rest. At lower %'s she'll mix her dair game up by either grabbing you after it or DI away after to make you do a U smash thinking that she'll try to combo you after it. The d air has diagonal hit boxes and its out there for a long time. Jigglypuff may not have a glide toss but shes very scary when she has a banana in her hands. If you try sheilding the banana she will follow up with pound which if your shield is less than 50% it will break giving Jigglypuff the chance to do a free fsmash or dsmash. If your near the ledge and you are playing against a smart Jigglypuff they will use the d smash and when that thing is charged your sent flying away and downards from the stage and trust me after that you won't be able to recover. Jigglypuff can also follow up with Rest but that dosn't happen much since its to risky. I haven't mentioned this much because it shouldn't be something to worry about but don't forget about rollout. Although Jigglypuff will slip on a nana out of rollout and thowing a naner at her will stop her also if this hits you you will die if your above 60% and thats something you don't want. Jigglypuff can also reverse b the startup in the air so it might look like shes charging towards you but actually shes going to go the opposite way and then hit you after you mis timed your attack or jump. The safest thing to do here is stay in the air the whole time. If she's still charging and your out of jumps quickly fall and then jump again. Don't sheild this because she can turn it 3 to 4 times which will either sheild poke you or break your shield.
What to avoid: Basically being off the stage. Also some Jigglypuffs have masterd this but not many. This is going to be scarey but Jigglypuff can rest out of multi hit combos. Meaning she can rest you out of your Fsmash, U smash, and AAA jab. Never ever use these smashes against them if your at high % and you know your playing a good puff. I wouldn't be surprised if some even tried to trick you by purpously missing a rest just to hit you with rest easier.
What to use: Fair fair fair. It out priorities Jigglypuffs fair and all of her other moves. Of course its going to be much harder for you to time it correctly since you don't have the arieal mobility that Jigglypuff has. But you CAN beat her in the air.
Counter picks: Jigglypuff is bad at stages with short ceilings or stages where she can't gimp you. Bring her to places such as FD, Castle Siege, Halberd, and SV. Jigglypuff on the other hand, has a ton load of cps against you such as Japes, Brinstar, RC, Norfair, Lylat, YI, BF, and Frigate. Don't be afraid of Jigglypuff if she cps' with Delfino, its not THAT good for her and most of the time its very hard for them to hit with rest in the water. You have a dair which will kill them regardless of % and you have a better chance at hitting them with it.
