vs DarkMusician 
Yoshi does not win this matchup. I would consider him to solidly be -1, or maybe leaning towards -2 against Rosalina. Yoshi's arsenal is far from being virtually safe as you like to point out. Fair is safe on shield if SH'd properly, but more often than not we will get punished by a shielded grab.
That was with customs. I don't know why he barely used luma warp but yeah, luma shot makes this a lot better. But my arguments were without customs. Even then, half of the time Rosalina traded with Yoshi's eggs (side b has a surprising amount of lag), which is a win for Yoshi because he weighs a lot more.
Also, you started challenging Rosalina's aerials at the worst times. Of note was the last kill of the first game.
I hate to be that guy but that player won because he was better. That guy's Rosalina was on point.
Our down b is not as great as you think, Delta pointed out its weakness above. It is a move that is simply too slow to reliably use in neutral. It also is a move with tremendous end lag, so any whiffed down B will be punished freely.
Unless your definition of tremendous endlag is "punishable by any move whatsoever" it does not have "tremendous endlag". Unless you want to tell me that there is enough time for me to spot dodge both the second hit AND the stars and then usmash you, it's pretty safe. Grabs don't count. I touched on grabs earlier in the thread and as well as below.
If we are tossing out kill moves left and right, there is no way not to get punished for it. Usmash, fsmash, down b, bair all have a decent end lag which any competent player will capitalize on. Fishing for any sort of kill move constantly will easily backfire.
With the exception of bair which is punishable by a Rosa usmash (because she ducks so low), none of these are punishable by anything other than a grab. This is generally difficult to do because there are several locations Yoshi can land on the ground thanks to his amazing air speed. And we're back to the grabs. Keep reading, you'll reach that part eventually.
Yoshi will not be hitting Rosa anytime soon while in the air. Rosa's aerial options outclass yoshi's by quite a bit. While we do have nair, and I guess an annoying dair, Rosa with or without luma has Uair/Dair, Fair, and Nair to prevent yoshi from going for any sort of followups. Sure I we can heavy armor through the Rosa dair, but more likely than not Rosa out prioritizes us with her aerials.
Maybe you're right. But then this is probably a sign you should just stay on the ground and toss up eggs, which will most likely hit us even if we airdodge due to hitbox shenanigans (egg hitboxes = Rosalina hitboxes = very large). At that point, you can then aerial us when we get stuck in the endlag of a GP. Most likely you will continue throwing eggs because the Rosalina player must reset to neutral by jumping away. You then get a lot of stage control.
Yoshi really doesn't need follow ups when he can just egg any Rosalina out of the sky. If they're too high to egg, then just stay on the ground. They either have to reset to neutral (which Yoshi wins) or attempt to attack you somehow. There are no empty jump grabs with a character that floaty so you can just shield and punish.
I can't stress enough how bad those eggs are for Rosalina. If they touch the Luma they hit Rosalina too.
Btw, a couple things.
Our fair isn't safe to space with. It has decent amounts of endlag and takes forever to finish. If you see someone toss that out in neutral and they're close enough, DA them. Most probably just hit a wrong button.
Despite having one of the best dairs in the game, by nature of it being a dair it can generally be challenged by a usmash or uair if I'm using it onstage. Both of Yoshi's will kill. We don't want to trade with them anyway unless Yoshi would somehow die (not until ~120ish side stage, if that). Also, if we flat out miss you can DA us. If we hit your shield you just nair OoS or, more likely, usmash. Like I said, no empty jump grabs here.
Generally speaking a Rosalina player almost never dairs into grounded opponents or even Yoshis that are airborne below. It can net kills sure but it's generally unsafe and should only be used as a mixup. Why the hell would I take a risk like that without some serious reward? The last kill of the first matchup is an example of an appropriate dair because she could kill there if it landed and you couldn't if you landed the uair.
In any case, any aerial loses to egg. Egg beats everything. It has so much priority and such massive splash damage it takes a Jiggly side b to tink with it and not get hit. It eats through all of Rosalina's aerials flawlessly and it has a ton of hitstun. You really cannot overstate how good of a move Yoshi's up b is. It's his best move and Rosalina can't challenge it with anything in her arsenal. She can only go around it.
I agree that eggs are an important tool to win the neutral for yoshi, but Rosa's GP negates it quite handily. Even without GP, she can run up with Luma as her shield then shield herself too. Anytime yoshi goes in the air for a SH egg toss, that is when he is at a disadvantage, you simply dash toward underneath the egg and dash attack/grab because of the considerable end lag on eggs. We lose considerable stage control if egg toss gets countered by the rosa.
In order for a GP to be converted into a punish other than a dash attack, it has to be done before you throw your next egg. The effect of the GP sticks around for a brief moment after Rosalina regains control, but the move itself lasts a long time (longer than the egg toss, at least) so this is risky. And this only works when close. I don't want to be doing anything other than shielding against a Yoshi SH Fair. DA is all we have here, and that generally only hits because the eggs are spaced badly.
Considerable end lag on eggs, huh? You can definitely toss enough in rapid succession (seen at 1:31) to keep us at bay. Rosalina only hit you because you didn't throw one upwards.
The stage control thing is definitely true, but how hard is it for a Yoshi player (who is now in the air from the DA) to just float to the other side of the stage and grab ledge? Much like defensive Yoshi is bad, Rosalina in neutral is also bad. As soon as you make a reset and gain some distance the process starts all over again.
For customs, Luma star bits and luma warp dramatically increase her offensive and defensive potential. We benefit little from customs, our default neutral B will not help, while Egg lay is marginally better to obtain stage control.
No argument here. But I talked about this above.
Rosa's jabs, tilts, and even smashes disrupt Yoshi's neutral game. We cannot just throw out any move and expect trades to go in our favor, Rosa quite easily pushes her offensive and defensive pressure. She is an incredible wall with or without luma, and she beats yoshi on the ground and in the air. We are not +2 against her, and a lot of us agree that she is an unfavorable MU for yoshi.
She does not beat Yoshi on the ground. Your dash attack instantly takes out Luma and unless Rosalina is near the edge a properly spaced one sends you too far past her to do anything with. I don't even think we can grab before you spot dodge. Even if we can grab we can't do anything else. I can't stress this enough: Rosalina can't win this match by doing nothing but grabs. We have to somehow kill Yoshi sub 120 consistently in order to keep up. For reference, the general kill percentage for a Yoshi is in the 170-180 range outside of a lucky punish.
You can safely SH Fair us and we can't do jack about it except for a possible usmash. If you even so much as soft read an usmash to attempt to punish that you convert into a Luma kill via the DA or at higher percents simply slide into your own usmash, which kills at around 100, I believe.
If we are close to the edge SH dair is safe as you simply fall off and double jump back. SH dair is actually normally safe because it breaks shields and even usmash can't beat it (it eats through usmash). It also does around 20 to 30 damage. In the case that we dodge Yoshi goes so far that we can't punish with any kill moves, again.
In comparison, thanks to Yoshi's floatiness, Rosalina isn't hitting him for more than about 10 to 15 damage at a time. The jab combo is one of Rosalina's best moves and it does jack against Yoshi. I will admit that this is where grabs come into play since they do quite a bit of damage, but they're grabs and they have limitations.
Yoshi has a ton of combos in this matchup as well. They aren't true combos but the Rosalina player HAS to run away to avoid them. DA hits? That's an unpunishable usmash or uair that we have to run away from. Rosalina's dair isn't so scary when it doesn't have a luma attached (it spikes, but that's it).
The Yoshi player that plays safe and knows the matchup well will destroy any opposing Rosalina outside of a sufficient skill difference.
