I actually watched the full set. I don't mind watching match-ups that most people find boring, as I usually find them interesting in other ways. Watching this was a nice lesson in the Jigglypuff match-up, which I've always thought to be really screwed up for Samus.
A couple of things about Jigglypuff, though it seemed like Cyr was aware of most of these things:
- Don't challenge Jigglypuff in the air. All her aerials beat yours.
That being said, I really liked Cyr's quick use of shffled nairs, whether it was to punish an aerial or baiting a jump. However, it seems he was abusing them a bit too much to begin with, and Infernum caught on and just stayed on the ground and rested him out of it. Most of the time, they were hard to punish though. Same goes for the dairs. Dair > dsmash is a nice combo, haha.
He needs to be really careful with coming down with an aerial vs. Puff when they're both in the air and he's above Puff. Lots of times, he was punished with an uair. Number one priority is to get down on the stage again, so just abuse those bombs until you find an opening. Suddenly FFing with an aerial can work, but you need to be really careful that the opponent isn't aware of it.
- Charge Shot is the best.
I find that Charge Shot is one of the things that make this matchup bearable. Cyr seemed to know this. If you knock Jigglypuff away, chasing her is usually pointless. Use the time to charge. Fully charged charge shot beats everything Jigglypuff has in the air, so it's both excellent for racking up damage as well as KOing early, hell, it's even good just for pressuring her in the air. Might not be a bad idea to simply wavedash away from a bair spamming Jiggs and just charge as much as you can.
Also, I find that homing missiles are actually decent against Jiggs. They're much better at annoying her than super missiles, since she can easily avoid those.
- Be really careful about Samus' laggy moves.
Fairly sure Jiggs can punish dsmash on shield with a rest, dunno about dtilt. I have a tendency to dtilt Jiggs when shielding on the ground, though I'm not sure Jigglypuff can really punish it that easily (as I said though, I don't play against a lot of Puff players so I really dunno). If you can grab Jiggs, it's actually fairly good against her (sometimes dthrow combos into a nair), but you really need to be sure you'll hit if you want to use it. I dunno, it's something to think about if you see Jiggs shielding a lot on the ground.
Other than that...
I don't think I saw UpB used offensively... at all. It's actually really good when you're under Jiggs, in my experience. If you FF it, it's fairly safe. On FoD, it's even more safe if you can hit the middle platform - should be a good option if you're close to her and shielding, as it has a tendency to shieldpoke or catch the opponent before they jump/grab/whatever. Cyr got fsmashed a few times when trying to wavedash out of shield, so that might be a good mix-up.
Similarly, I saw no use of uair either. It pokes Jigglypuff really well, though getting below her is obviously a problem.
Recovering against Jigglypuff is really tricky, especially on battlefield, but don't try to challenge her in the air on the way in. Just be patient with your bombs, move back and forth as much as you can to avoid her attacks.
That was some general advice. He's no doubt a more experienced player than I am, so he probably knows most of these things (he was definitely aware of most of the things mentioned here - that much I could see), and I thought he played a very solid match. Thanks for the link, it also helped me quite a bit.