GhostUrsa
Smash Ace
I have a little. It isn't much, but I'll share what I know. His attacks have a lot more range and speed than you think, so make sure to use most of your attacks from as far of range as possible. Approaching from the air can be difficult due to his eggs, so unpredictability is key to maintaining any pressure when you need to be offensive. Yoshi's eggs have enough oomph to them to for neutral, but require commitment for their arc (He can't rapid fire the things, luckily).
If you are under him, be prepared for his D-air as it has great range and can shut down almost any anti-air move during it's animation. I prefer to wait out the attack via shield and then grab. If you are below and behind him, his tail slap b-air isn't quite the shutdown but benefits from a similar counter tactic.
To make a Yoshi player sweat, you need to get them off-stage. Yoshi's recovery is terrible in the low and deep angles, which makes him prime Eruption fodder. If you have an Egg happy Yoshi that knows how to angle them under pressure while low, walk off f-air and b-air are your friend (he has no extra recovery options once his second jump is used up, so it's an easy gimp as long as you have good aim.) From level or high recoveries it is very difficult to go for the kill as he'll be spamming eggs to slow his descent, walling you out while waiting for an opening to use his second jump. You want to scare him into a low or deep recovery ideally, so F-air or Air dodging is a good way to avoid the eggs while staying near the ledge.
If we are off-stage, we have to worry about getting gimped by eggs and his f-air (that spike!). Save that double jump, as it is your best defense against being gimped via eggs. Rising f-airs and rising Air-dodges into Aether can help you avoid being slam dunked as long as you get the timing right.
If you are under him, be prepared for his D-air as it has great range and can shut down almost any anti-air move during it's animation. I prefer to wait out the attack via shield and then grab. If you are below and behind him, his tail slap b-air isn't quite the shutdown but benefits from a similar counter tactic.
To make a Yoshi player sweat, you need to get them off-stage. Yoshi's recovery is terrible in the low and deep angles, which makes him prime Eruption fodder. If you have an Egg happy Yoshi that knows how to angle them under pressure while low, walk off f-air and b-air are your friend (he has no extra recovery options once his second jump is used up, so it's an easy gimp as long as you have good aim.) From level or high recoveries it is very difficult to go for the kill as he'll be spamming eggs to slow his descent, walling you out while waiting for an opening to use his second jump. You want to scare him into a low or deep recovery ideally, so F-air or Air dodging is a good way to avoid the eggs while staying near the ledge.
If we are off-stage, we have to worry about getting gimped by eggs and his f-air (that spike!). Save that double jump, as it is your best defense against being gimped via eggs. Rising f-airs and rising Air-dodges into Aether can help you avoid being slam dunked as long as you get the timing right.