Olimar isn't very hard for yoshi at all.
Gashi asked me to post this for him since he wants to keep his 8,888 post count I guess.
Z'zgashi said:
Oli is good on Frigate for multiple reasons, the first being that his Pikmin ratios are better than ever on this stage, he masses Purples and Yellows. The second, is that Oli can camp really well here, and this is especially apparent in the second transformation. If you give oli the middle dip, you're screwed. His pivot will grab up the hill, he can throw pikmin wherever, he can usmash through the platform above that is protecting him, and he's so small that nothing will hit him.
First, getting a bunch of purple/yellow is arguably not a good thing for him. (I'd say yellow are the second most useless for him vs us), and purples are really only good for camping/KO'ing. Also the stage doesn't change the odds that much. It's like 30% for yellow/purple as opposed to the standard 20%.
Olimar in the middle is kinda scary, but he can't throw yellows/purples anywhere from there. They both have terrible lobs for throwing for distance. And we are just as strong in the center as oli is. One last thing, if you camp the sides while he's in the middle what is he going to do? Wait for it to flip back over and put us at an advantage again?
Yes olimar is fairly good at the second part, but the flips and the lack of a ledge and overall bad layout for him on the first part (flat with only 1 real platform that is too far out of the way to help him) really make this stage bad for him. Then on top of that the flips FORCE him into the air. Our whole goal in this match up is to get olimar in the air, and at frigate the stage does it for us. Take advantage of the flips.